{"id":570840,"date":"2026-07-27T14:56:47","date_gmt":"2026-07-27T07:56:47","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=570840"},"modified":"2026-07-27T15:46:46","modified_gmt":"2026-07-27T08:46:46","slug":"ph-la-gi","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/ph-la-gi\/","title":{"rendered":"pH l\u00e0 g\u00ec? Thang pH, c\u00e1ch \u0111o v\u00e0 \u00fd ngh\u0129a trong th\u1ef1c t\u1ebf"},"content":{"rendered":"<p><strong>pH l\u00e0 ch\u1ec9 s\u1ed1 d\u00f9ng \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 \u0111\u1ed9 axit hay \u0111\u1ed9 baz\u01a1 (ki\u1ec1m) c\u1ee7a m\u1ed9t dung d\u1ecbch, v\u1edbi thang gi\u00e1 tr\u1ecb th\u00f4ng d\u1ee5ng t\u1eeb 0 \u0111\u1ebfn 14: pH &lt; 7 l\u00e0 m\u00f4i tr\u01b0\u1eddng axit, pH = 7 l\u00e0 trung t\u00ednh v\u00e0 pH &gt; 7 l\u00e0 m\u00f4i tr\u01b0\u1eddng baz\u01a1.<\/strong> V\u1ec1 m\u1eb7t h\u00f3a h\u1ecdc, pH \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh d\u1ef1a tr\u00ean n\u1ed3ng \u0111\u1ed9 ion H\u207a c\u00f3 trong dung d\u1ecbch theo c\u00f4ng th\u1ee9c pH = -log[H\u207a]. \u0110\u00e2y l\u00e0 ki\u1ebfn th\u1ee9c n\u1ec1n t\u1ea3ng c\u1ee7a m\u00f4n H\u00f3a h\u1ecdc, \u0111\u1ed3ng th\u1eddi xu\u1ea5t hi\u1ec7n r\u1ea5t nhi\u1ec1u trong \u0111\u1eddi s\u1ed1ng, t\u1eeb n\u01b0\u1edbc u\u1ed1ng, \u0111\u1ea5t tr\u1ed3ng cho t\u1edbi m\u1ef9 ph\u1ea9m. C\u00f9ng t\u00ecm hi\u1ec3u chi ti\u1ebft pH l\u00e0 g\u00ec, thang \u0111o, c\u00e1ch x\u00e1c \u0111\u1ecbnh v\u00e0 \u00fd ngh\u0129a th\u1ef1c t\u1ebf c\u1ee7a ch\u1ec9 s\u1ed1 n\u00e0y ngay d\u01b0\u1edbi \u0111\u00e2y.<\/p>\n<h2>pH l\u00e0 g\u00ec?<\/h2>\n<p>pH l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng \u0111\u1eb7c tr\u01b0ng cho t\u00ednh axit ho\u1eb7c t\u00ednh baz\u01a1 c\u1ee7a m\u1ed9t dung d\u1ecbch, ph\u1ea3n \u00e1nh \u0111\u1ed9 ho\u1ea1t \u0111\u1ed9ng (n\u1ed3ng \u0111\u1ed9) c\u1ee7a ion hi\u0111ro H\u207a trong dung d\u1ecbch. Gi\u00e1 tr\u1ecb pH c\u00e0ng nh\u1ecf th\u00ec dung d\u1ecbch c\u00e0ng c\u00f3 t\u00ednh axit m\u1ea1nh; ng\u01b0\u1ee3c l\u1ea1i pH c\u00e0ng l\u1edbn th\u00ec t\u00ednh baz\u01a1 (ki\u1ec1m) c\u00e0ng m\u1ea1nh.<\/p>\n<p>V\u1ec1 b\u1ea3n ch\u1ea5t, pH ph\u1ea3n \u00e1nh n\u1ed3ng \u0111\u1ed9 ion hi\u0111ro H\u207a trong dung d\u1ecbch: n\u1ed3ng \u0111\u1ed9 H\u207a c\u00e0ng l\u1edbn th\u00ec pH c\u00e0ng nh\u1ecf. M\u1ed1i quan h\u1ec7 n\u00e0y \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng c\u00f4ng th\u1ee9c:<\/p>\n<ul>\n<li><strong>pH = -log[H\u207a]<\/strong>, trong \u0111\u00f3 [H\u207a] l\u00e0 n\u1ed3ng \u0111\u1ed9 ion H\u207a t\u00ednh theo mol\/l\u00edt (mol\/L).<\/li>\n<li>V\u00ed d\u1ee5: dung d\u1ecbch c\u00f3 [H\u207a] = 10\u207b\u00b3 mol\/L th\u00ec pH = 3 (t\u00ednh axit); dung d\u1ecbch c\u00f3 [H\u207a] = 10\u207b\u2077 mol\/L th\u00ec pH = 7 (trung t\u00ednh).<\/li>\n<\/ul>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-570844\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/ph-2.jpg\" alt=\"ph-2\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/ph-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/ph-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/ph-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>Thang pH v\u00e0 \u00fd ngh\u0129a<\/h2>\n<p>Thang pH th\u00f4ng d\u1ee5ng ch\u1ea1y t\u1eeb 0 \u0111\u1ebfn 14, chia dung d\u1ecbch th\u00e0nh ba nh\u00f3m m\u00f4i tr\u01b0\u1eddng ch\u00ednh. B\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y t\u00f3m t\u1eaft c\u00e1ch ph\u00e2n lo\u1ea1i k\u00e8m v\u00ed d\u1ee5 ch\u1ea5t ti\u00eau bi\u1ec3u \u0111\u1ec3 b\u1ea1n d\u1ec5 h\u00ecnh dung.<\/p>\n<table>\n<thead>\n<tr>\n<th>Kho\u1ea3ng pH<\/th>\n<th>M\u00f4i tr\u01b0\u1eddng<\/th>\n<th>V\u00ed d\u1ee5 ch\u1ea5t ti\u00eau bi\u1ec3u<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>pH &lt; 7<\/td>\n<td>Axit (c\u00e0ng nh\u1ecf c\u00e0ng axit m\u1ea1nh)<\/td>\n<td>N\u01b0\u1edbc chanh, gi\u1ea5m \u0103n, d\u1ecbch v\u1ecb d\u1ea1 d\u00e0y<\/td>\n<\/tr>\n<tr>\n<td>pH = 7<\/td>\n<td>Trung t\u00ednh<\/td>\n<td>N\u01b0\u1edbc tinh khi\u1ebft \u1edf \u0111i\u1ec1u ki\u1ec7n th\u01b0\u1eddng<\/td>\n<\/tr>\n<tr>\n<td>pH &gt; 7<\/td>\n<td>Baz\u01a1 \/ ki\u1ec1m (c\u00e0ng l\u1edbn c\u00e0ng ki\u1ec1m m\u1ea1nh)<\/td>\n<td>N\u01b0\u1edbc x\u00e0 ph\u00f2ng, dung d\u1ecbch x\u00fat, baking soda<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>M\u1ed9t \u0111i\u1ec3m quan tr\u1ecdng: thang pH c\u00f3 t\u00ednh logarit, ngh\u0129a l\u00e0 m\u1ed7i \u0111\u01a1n v\u1ecb pH t\u01b0\u01a1ng \u1ee9ng v\u1edbi ch\u00eanh l\u1ec7ch 10 l\u1ea7n v\u1ec1 n\u1ed3ng \u0111\u1ed9 H\u207a. Do \u0111\u00f3 dung d\u1ecbch pH = 3 c\u00f3 t\u00ednh axit m\u1ea1nh g\u1ea5p kho\u1ea3ng 10 l\u1ea7n dung d\u1ecbch pH = 4, v\u00e0 g\u1ea5p kho\u1ea3ng 100 l\u1ea7n dung d\u1ecbch pH = 5. \u0110\u00e2y c\u0169ng l\u00e0 l\u00fd do c\u00e1c axit m\u1ea1nh v\u00e0 baz\u01a1 m\u1ea1nh c\u1ea7n \u0111\u01b0\u1ee3c x\u1eed l\u00fd c\u1ea9n th\u1eadn, b\u1edfi ch\u00eanh l\u1ec7ch nh\u1ecf tr\u00ean thang \u0111o \u0111\u00e3 ph\u1ea3n \u00e1nh m\u1ee9c \u0111\u1ed9 kh\u00e1c bi\u1ec7t r\u1ea5t l\u1edbn v\u1ec1 h\u00f3a h\u1ecdc.<\/p>\n<h2>C\u00e1ch x\u00e1c \u0111\u1ecbnh pH c\u1ee7a dung d\u1ecbch<\/h2>\n<p>C\u00f3 nhi\u1ec1u c\u00e1ch x\u00e1c \u0111\u1ecbnh \u0111\u1ed9 pH t\u00f9y v\u00e0o m\u1ee9c \u0111\u1ed9 ch\u00ednh x\u00e1c m\u00e0 b\u1ea1n c\u1ea7n, t\u1eeb quan s\u00e1t nhanh cho t\u1edbi \u0111o b\u1eb1ng thi\u1ebft b\u1ecb chuy\u00ean d\u1ee5ng.<\/p>\n<ul>\n<li><strong>Gi\u1ea5y qu\u1ef3 t\u00edm:<\/strong> qu\u1ef3 t\u00edm h\u00f3a \u0111\u1ecf trong m\u00f4i tr\u01b0\u1eddng axit, h\u00f3a xanh trong m\u00f4i tr\u01b0\u1eddng baz\u01a1 v\u00e0 kh\u00f4ng \u0111\u1ed5i m\u00e0u trong m\u00f4i tr\u01b0\u1eddng trung t\u00ednh. C\u00e1ch n\u00e0y ch\u1ec9 cho bi\u1ebft m\u00f4i tr\u01b0\u1eddng, kh\u00f4ng cho gi\u00e1 tr\u1ecb pH c\u1ee5 th\u1ec3.<\/li>\n<li><strong>Gi\u1ea5y ch\u1ec9 th\u1ecb (gi\u1ea5y \u0111o pH):<\/strong> \u0111\u1ed5i m\u00e0u theo d\u1ea3i m\u00e0u chu\u1ea9n in s\u1eb5n, gi\u00fap b\u1ea1n \u0111\u1ecdc \u0111\u01b0\u1ee3c gi\u00e1 tr\u1ecb pH g\u1ea7n \u0111\u00fang.<\/li>\n<li><strong>Ch\u1ea5t ch\u1ec9 th\u1ecb m\u00e0u:<\/strong> c\u00e1c dung d\u1ecbch nh\u01b0 phenolphtalein, metyl da cam \u0111\u1ed5i m\u00e0u theo m\u00f4i tr\u01b0\u1eddng, th\u01b0\u1eddng d\u00f9ng trong th\u00ed nghi\u1ec7m chu\u1ea9n \u0111\u1ed9.<\/li>\n<li><strong>M\u00e1y \u0111o pH (b\u00fat \u0111o pH):<\/strong> cho k\u1ebft qu\u1ea3 ch\u00ednh x\u00e1c nh\u1ea5t t\u1edbi t\u1eebng ch\u1eef s\u1ed1 th\u1eadp ph\u00e2n, \u0111\u01b0\u1ee3c d\u00f9ng trong ph\u00f2ng th\u00ed nghi\u1ec7m, s\u1ea3n xu\u1ea5t v\u00e0 nu\u00f4i tr\u1ed3ng th\u1ee7y s\u1ea3n.<\/li>\n<\/ul>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-570843\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/ph-1.jpg\" alt=\"ph-1\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/ph-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/ph-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/ph-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>Gi\u00e1 tr\u1ecb pH c\u1ee7a m\u1ed9t s\u1ed1 ch\u1ea5t quen thu\u1ed9c<\/h2>\n<p>\u0110\u1ec3 d\u1ec5 h\u00ecnh dung, b\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y li\u1ec7t k\u00ea gi\u00e1 tr\u1ecb pH tham kh\u1ea3o c\u1ee7a m\u1ed9t s\u1ed1 ch\u1ea5t v\u00e0 m\u00f4i tr\u01b0\u1eddng quen thu\u1ed9c trong \u0111\u1eddi s\u1ed1ng. C\u00e1c con s\u1ed1 c\u00f3 th\u1ec3 thay \u0111\u1ed5i t\u00f9y n\u1ed3ng \u0111\u1ed9 v\u00e0 nhi\u1ec7t \u0111\u1ed9 n\u00ean ch\u1ec9 mang t\u00ednh tham kh\u1ea3o.<\/p>\n<table>\n<thead>\n<tr>\n<th>Ch\u1ea5t \/ m\u00f4i tr\u01b0\u1eddng<\/th>\n<th>pH tham kh\u1ea3o<\/th>\n<th>T\u00ednh ch\u1ea5t<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>D\u1ecbch v\u1ecb d\u1ea1 d\u00e0y<\/td>\n<td>kho\u1ea3ng 1,5 \u2013 2<\/td>\n<td>Axit m\u1ea1nh<\/td>\n<\/tr>\n<tr>\n<td>N\u01b0\u1edbc chanh, gi\u1ea5m \u0103n<\/td>\n<td>kho\u1ea3ng 2 \u2013 3<\/td>\n<td>Axit<\/td>\n<\/tr>\n<tr>\n<td>N\u01b0\u1edbc u\u1ed1ng th\u00f4ng th\u01b0\u1eddng<\/td>\n<td>kho\u1ea3ng 6,5 \u2013 8,5<\/td>\n<td>G\u1ea7n trung t\u00ednh<\/td>\n<\/tr>\n<tr>\n<td>M\u00e1u ng\u01b0\u1eddi<\/td>\n<td>kho\u1ea3ng 7,35 \u2013 7,45<\/td>\n<td>Ki\u1ec1m nh\u1eb9<\/td>\n<\/tr>\n<tr>\n<td>N\u01b0\u1edbc x\u00e0 ph\u00f2ng<\/td>\n<td>kho\u1ea3ng 9 \u2013 10<\/td>\n<td>Baz\u01a1<\/td>\n<\/tr>\n<tr>\n<td>Dung d\u1ecbch x\u00fat (NaOH)<\/td>\n<td>kho\u1ea3ng 13 \u2013 14<\/td>\n<td>Baz\u01a1 m\u1ea1nh<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-570845\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/ph-3.jpg\" alt=\"ph-3\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/ph-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/ph-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/ph-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>\u00dd ngh\u0129a v\u00e0 \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf c\u1ee7a pH<\/h2>\n<p>Ch\u1ec9 s\u1ed1 pH c\u00f3 vai tr\u00f2 quan tr\u1ecdng trong r\u1ea5t nhi\u1ec1u l\u0129nh v\u1ef1c c\u1ee7a \u0111\u1eddi s\u1ed1ng v\u00e0 s\u1ea3n xu\u1ea5t.<\/p>\n<ul>\n<li><strong>N\u00f4ng nghi\u1ec7p:<\/strong> \u0111\u1ed9 pH c\u1ee7a \u0111\u1ea5t \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn kh\u1ea3 n\u0103ng h\u1ea5p th\u1ee5 dinh d\u01b0\u1ee1ng c\u1ee7a c\u00e2y; \u0111\u1ea5t qu\u00e1 chua ho\u1eb7c qu\u00e1 ki\u1ec1m \u0111\u1ec1u l\u00e0m c\u00e2y k\u00e9m ph\u00e1t tri\u1ec3n.<\/li>\n<li><strong>Nu\u00f4i tr\u1ed3ng th\u1ee7y s\u1ea3n:<\/strong> \u0111\u1ed9 pH c\u1ee7a n\u01b0\u1edbc quy\u1ebft \u0111\u1ecbnh s\u1ee9c kh\u1ecfe c\u1ee7a c\u00e1, t\u00f4m; ng\u01b0\u1eddi nu\u00f4i th\u01b0\u1eddng duy tr\u00ec pH \u1ed5n \u0111\u1ecbnh trong kho\u1ea3ng ph\u00f9 h\u1ee3p v\u1edbi t\u1eebng lo\u00e0i.<\/li>\n<li><strong>S\u1ee9c kh\u1ecfe con ng\u01b0\u1eddi:<\/strong> pH c\u1ee7a m\u00e1u \u0111\u01b0\u1ee3c c\u01a1 th\u1ec3 gi\u1eef \u1ed5n \u0111\u1ecbnh quanh 7,35 \u2013 7,45, c\u00f2n pH d\u1ea1 d\u00e0y \u1edf m\u1ee9c axit m\u1ea1nh gi\u00fap ti\u00eau h\u00f3a th\u1ee9c \u0103n.<\/li>\n<li><strong>M\u1ef9 ph\u1ea9m v\u00e0 ch\u0103m s\u00f3c da:<\/strong> nhi\u1ec1u s\u1ea3n ph\u1ea9m \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf c\u00f3 pH g\u1ea7n v\u1edbi pH t\u1ef1 nhi\u00ean c\u1ee7a da (kho\u1ea3ng 4,5 \u2013 5,5) \u0111\u1ec3 d\u1ecbu nh\u1eb9.<\/li>\n<li><strong>X\u1eed l\u00fd n\u01b0\u1edbc v\u00e0 c\u00f4ng nghi\u1ec7p th\u1ef1c ph\u1ea9m:<\/strong> pH \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t ch\u1eb7t ch\u1ebd \u0111\u1ec3 b\u1ea3o \u0111\u1ea3m n\u01b0\u1edbc \u0111\u1ea1t chu\u1ea9n v\u00e0 s\u1ea3n ph\u1ea9m an to\u00e0n.<\/li>\n<\/ul>\n<p>V\u00ec pH g\u1eafn v\u1edbi t\u00ednh axit \u2013 baz\u01a1, vi\u1ec7c hi\u1ec3u ch\u1ec9 s\u1ed1 n\u00e0y c\u0169ng gi\u00fap b\u1ea1n n\u1eafm r\u00f5 h\u01a1n v\u1ec1 ph\u1ea3n \u1ee9ng trung h\u00f2a gi\u1eefa axit v\u00e0 baz\u01a1. B\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o th\u00eam c\u00e1c b\u00e0i <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/axit-cacboxylic-la-gi\/\">Axit cacboxylic l\u00e0 g\u00ec?<\/a> v\u00e0 <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/kim-loai-kiem-la-gi\/\">Kim lo\u1ea1i ki\u1ec1m l\u00e0 g\u00ec?<\/a> \u0111\u1ec3 hi\u1ec3u v\u1ec1 nh\u1eefng ch\u1ea5t t\u1ea1o m\u00f4i tr\u01b0\u1eddng axit v\u00e0 baz\u01a1 \u0111i\u1ec3n h\u00ecnh.<\/p>\n<h2>L\u01b0u \u00fd an to\u00e0n khi l\u00e0m vi\u1ec7c v\u1edbi dung d\u1ecbch c\u00f3 pH c\u1ef1c tr\u1ecb<\/h2>\n<p>C\u00e1c dung d\u1ecbch c\u00f3 pH r\u1ea5t th\u1ea5p (axit m\u1ea1nh) ho\u1eb7c r\u1ea5t cao (baz\u01a1 m\u1ea1nh) \u0111\u1ec1u c\u00f3 th\u1ec3 g\u00e2y b\u1ecfng da v\u00e0 t\u1ed5n th\u01b0\u01a1ng m\u1eaft. V\u00ec v\u1eady:<\/p>\n<ul>\n<li>Khi l\u00e0m th\u00ed nghi\u1ec7m v\u1edbi c\u00e1c dung d\u1ecbch n\u00e0y c\u1ea7n \u0111eo b\u1ea3o h\u1ed9 v\u00e0 c\u00f3 s\u1ef1 gi\u00e1m s\u00e1t c\u1ee7a gi\u00e1o vi\u00ean.<\/li>\n<li>Kh\u00f4ng t\u1ef1 \u00fd pha tr\u1ed9n h\u00f3a ch\u1ea5t t\u1ea1i nh\u00e0, \u0111\u1eb7c bi\u1ec7t l\u00e0 c\u00e1c ch\u1ea5t t\u1ea9y r\u1eeda kh\u00e1c lo\u1ea1i v\u1edbi nhau.<\/li>\n<li>\u0110\u1ecdc k\u1ef9 h\u01b0\u1edbng d\u1eabn tr\u00ean s\u1ea3n ph\u1ea9m t\u1ea9y r\u1eeda gia d\u1ee5ng v\u00e0 b\u1ea3o qu\u1ea3n xa t\u1ea7m tay tr\u1ebb em.<\/li>\n<\/ul>\n<p>Vi\u1ec7c n\u1eafm \u0111\u01b0\u1ee3c b\u1ea3n ch\u1ea5t axit \u2013 baz\u01a1 v\u00e0 c\u1ea3 <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/phan-ung-oxi-hoa-khu-la-gi\/\">ph\u1ea3n \u1ee9ng oxi h\u00f3a kh\u1eed<\/a> s\u1ebd gi\u00fap b\u1ea1n hi\u1ec3u v\u00ec sao m\u1ed9t s\u1ed1 h\u00f3a ch\u1ea5t khi tr\u1ed9n l\u1eabn l\u1ea1i nguy hi\u1ec3m.<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-570846\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/ph-4.jpg\" alt=\"ph-4\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/ph-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/ph-4-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/ph-4-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n<h3>pH b\u1eb1ng bao nhi\u00eau l\u00e0 trung t\u00ednh?<\/h3>\n<p>pH = 7 l\u00e0 m\u00f4i tr\u01b0\u1eddng trung t\u00ednh, v\u00ed d\u1ee5 \u0111i\u1ec3n h\u00ecnh l\u00e0 n\u01b0\u1edbc tinh khi\u1ebft \u1edf \u0111i\u1ec1u ki\u1ec7n th\u01b0\u1eddng.<\/p>\n<h3>pH nh\u1ecf h\u01a1n 7 ngh\u0129a l\u00e0 g\u00ec?<\/h3>\n<p>Ngh\u0129a l\u00e0 dung d\u1ecbch c\u00f3 t\u00ednh axit; pH c\u00e0ng nh\u1ecf th\u00ec t\u00ednh axit c\u00e0ng m\u1ea1nh, v\u00ed d\u1ee5 n\u01b0\u1edbc chanh c\u00f3 pH kho\u1ea3ng 2 \u2013 3.<\/p>\n<h3>C\u00f4ng th\u1ee9c t\u00ednh pH l\u00e0 g\u00ec?<\/h3>\n<p>pH \u0111\u01b0\u1ee3c t\u00ednh theo c\u00f4ng th\u1ee9c pH = -log[H\u207a], trong \u0111\u00f3 [H\u207a] l\u00e0 n\u1ed3ng \u0111\u1ed9 ion H\u207a trong dung d\u1ecbch (mol\/L).<\/p>\n<h3>L\u00e0m sao \u0111\u1ec3 \u0111o pH c\u1ee7a dung d\u1ecbch?<\/h3>\n<p>B\u1ea1n c\u00f3 th\u1ec3 d\u00f9ng gi\u1ea5y qu\u1ef3 t\u00edm, gi\u1ea5y ch\u1ec9 th\u1ecb pH, ch\u1ea5t ch\u1ec9 th\u1ecb m\u00e0u ho\u1eb7c m\u00e1y \u0111o pH; trong \u0111\u00f3 m\u00e1y \u0111o pH cho k\u1ebft qu\u1ea3 ch\u00ednh x\u00e1c nh\u1ea5t.<\/p>\n<h3>V\u00ec sao \u0111\u1ed9 pH l\u1ea1i quan tr\u1ecdng?<\/h3>\n<p>V\u00ec \u0111\u1ed9 pH \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn tr\u1ed3ng tr\u1ecdt, nu\u00f4i tr\u1ed3ng th\u1ee7y s\u1ea3n, s\u1ee9c kh\u1ecfe, m\u1ef9 ph\u1ea9m, th\u1ef1c ph\u1ea9m v\u00e0 x\u1eed l\u00fd n\u01b0\u1edbc.<\/p>\n<h3>pH c\u1ee7a n\u01b0\u1edbc u\u1ed1ng bao nhi\u00eau l\u00e0 t\u1ed1t?<\/h3>\n<p>N\u01b0\u1edbc u\u1ed1ng th\u00f4ng th\u01b0\u1eddng c\u00f3 pH kho\u1ea3ng 6,5 \u2013 8,5, t\u1ee9c g\u1ea7n v\u1edbi m\u1ee9c trung t\u00ednh v\u00e0 an to\u00e0n cho s\u1ee9c kh\u1ecfe.<\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>T\u00f3m l\u1ea1i, <strong>pH l\u00e0 ch\u1ec9 s\u1ed1 \u0111o \u0111\u1ed9 axit \u2013 baz\u01a1 c\u1ee7a dung d\u1ecbch tr\u00ean thang 0 \u2013 14, trong \u0111\u00f3 pH &lt; 7 l\u00e0 axit, pH = 7 l\u00e0 trung t\u00ednh v\u00e0 pH &gt; 7 l\u00e0 baz\u01a1<\/strong>, \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh theo c\u00f4ng th\u1ee9c pH = -log[H\u207a]. Hi\u1ec3u v\u1ec1 pH kh\u00f4ng ch\u1ec9 gi\u00fap b\u1ea1n h\u1ecdc t\u1ed1t m\u00f4n H\u00f3a m\u00e0 c\u00f2n \u1ee9ng d\u1ee5ng \u0111\u01b0\u1ee3c v\u00e0o nhi\u1ec1u t\u00ecnh hu\u1ed1ng th\u1ef1c t\u1ebf nh\u01b0 ch\u1ecdn n\u01b0\u1edbc u\u1ed1ng, ch\u0103m s\u00f3c da hay nu\u00f4i tr\u1ed3ng. M\u1eddi b\u1ea1n theo d\u00f5i th\u00eam c\u00e1c b\u00e0i vi\u1ebft ki\u1ebfn th\u1ee9c kh\u00e1c tr\u00ean chuy\u00ean m\u1ee5c tin t\u1ee9c c\u1ee7a Ho\u00e0ng H\u00e0 Mobile. B\u1ea1n c\u0169ng c\u00f3 th\u1ec3 tham kh\u1ea3o th\u00eam <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/toc-do-phan-ung-la-gi\/\">t\u1ed1c \u0111\u1ed9 ph\u1ea3n \u1ee9ng l\u00e0 g\u00ec<\/a> \u0111\u1ec3 hi\u1ec3u v\u00ec sao c\u00e1c ph\u1ea3n \u1ee9ng h\u00f3a h\u1ecdc di\u1ec5n ra v\u1edbi t\u1ed1c \u0111\u1ed9 kh\u00e1c nhau.<br \/>\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"pH b\u1eb1ng bao nhi\u00eau l\u00e0 trung t\u00ednh?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"pH = 7 l\u00e0 m\u00f4i tr\u01b0\u1eddng trung t\u00ednh, v\u00ed d\u1ee5 \u0111i\u1ec3n h\u00ecnh l\u00e0 n\u01b0\u1edbc tinh khi\u1ebft \u1edf \u0111i\u1ec1u ki\u1ec7n th\u01b0\u1eddng.\"}},{\"@type\":\"Question\",\"name\":\"pH nh\u1ecf h\u01a1n 7 ngh\u0129a l\u00e0 g\u00ec?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Ngh\u0129a l\u00e0 dung d\u1ecbch c\u00f3 t\u00ednh axit; pH c\u00e0ng nh\u1ecf th\u00ec t\u00ednh axit c\u00e0ng m\u1ea1nh, v\u00ed d\u1ee5 n\u01b0\u1edbc chanh c\u00f3 pH kho\u1ea3ng 2 \u0111\u1ebfn 3.\"}},{\"@type\":\"Question\",\"name\":\"C\u00f4ng th\u1ee9c t\u00ednh pH l\u00e0 g\u00ec?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"pH \u0111\u01b0\u1ee3c t\u00ednh theo c\u00f4ng th\u1ee9c pH = -log[H\u207a], trong \u0111\u00f3 [H\u207a] l\u00e0 n\u1ed3ng \u0111\u1ed9 ion H\u207a trong dung d\u1ecbch t\u00ednh b\u1eb1ng mol\/L.\"}},{\"@type\":\"Question\",\"name\":\"L\u00e0m sao \u0111\u1ec3 \u0111o pH c\u1ee7a dung d\u1ecbch?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"B\u1ea1n c\u00f3 th\u1ec3 d\u00f9ng gi\u1ea5y qu\u1ef3 t\u00edm, gi\u1ea5y ch\u1ec9 th\u1ecb pH, ch\u1ea5t ch\u1ec9 th\u1ecb m\u00e0u ho\u1eb7c m\u00e1y \u0111o pH; trong \u0111\u00f3 m\u00e1y \u0111o pH cho k\u1ebft qu\u1ea3 ch\u00ednh x\u00e1c nh\u1ea5t.\"}},{\"@type\":\"Question\",\"name\":\"V\u00ec sao \u0111\u1ed9 pH l\u1ea1i quan tr\u1ecdng?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"V\u00ec \u0111\u1ed9 pH \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn tr\u1ed3ng tr\u1ecdt, nu\u00f4i tr\u1ed3ng th\u1ee7y s\u1ea3n, s\u1ee9c kh\u1ecfe, m\u1ef9 ph\u1ea9m, th\u1ef1c ph\u1ea9m v\u00e0 x\u1eed l\u00fd n\u01b0\u1edbc.\"}},{\"@type\":\"Question\",\"name\":\"pH c\u1ee7a n\u01b0\u1edbc u\u1ed1ng bao nhi\u00eau l\u00e0 t\u1ed1t?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"N\u01b0\u1edbc u\u1ed1ng th\u00f4ng th\u01b0\u1eddng c\u00f3 pH kho\u1ea3ng 6,5 \u0111\u1ebfn 8,5, t\u1ee9c g\u1ea7n v\u1edbi m\u1ee9c trung t\u00ednh v\u00e0 an to\u00e0n cho s\u1ee9c kh\u1ecfe.\"}}]}\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>pH l\u00e0 ch\u1ec9 s\u1ed1 d\u00f9ng \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 \u0111\u1ed9 axit hay \u0111\u1ed9 baz\u01a1 (ki\u1ec1m) c\u1ee7a m\u1ed9t dung d\u1ecbch, v\u1edbi thang gi\u00e1 tr\u1ecb th\u00f4ng d\u1ee5ng t\u1eeb 0 \u0111\u1ebfn 14: pH &lt; 7 l\u00e0 m\u00f4i tr\u01b0\u1eddng axit, pH = 7 l\u00e0 trung t\u00ednh v\u00e0 pH &gt; 7 l\u00e0 m\u00f4i tr\u01b0\u1eddng baz\u01a1. V\u1ec1 m\u1eb7t h\u00f3a h\u1ecdc, pH \u0111\u01b0\u1ee3c [&hellip;]<\/p>\n","protected":false},"author":102,"featured_media":570847,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"pH l\u00e0 g\u00ec","_yoast_wpseo_title":"pH l\u00e0 g\u00ec? Thang pH, c\u00e1ch \u0111o v\u00e0 \u00fd ngh\u0129a trong th\u1ef1c t\u1ebf","_yoast_wpseo_metadesc":"pH l\u00e0 g\u00ec? T\u00ecm hi\u1ec3u thang pH 0-14, c\u00f4ng th\u1ee9c pH = -log[H\u207a], c\u00e1ch \u0111o v\u00e0 \u00fd ngh\u0129a c\u1ee7a \u0111\u1ed9 pH trong n\u01b0\u1edbc u\u1ed1ng, \u0111\u1ea5t tr\u1ed3ng, m\u1ef9 ph\u1ea9m v\u00e0 \u0111\u1eddi s\u1ed1ng.","footnotes":""},"categories":[3910,30453],"tags":[],"class_list":["post-570840","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-kham-pha","category-kien-thuc"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>pH l\u00e0 g\u00ec? Thang pH, c\u00e1ch \u0111o v\u00e0 \u00fd ngh\u0129a trong th\u1ef1c t\u1ebf<\/title>\n<meta name=\"description\" content=\"pH l\u00e0 g\u00ec? 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