产品名称 : | PH1821 | 醋酸-醋酸钠缓冲液 (pH3.6-6.0) Acetic Acid-Sodium Acetate Buffer |
产品品牌 : | 飞净 PHYGENE |
货号:PH1821
规格:500mL
运输与保存:常温运输与保存。
有效期:12个月
缓冲溶液作用原理和pH值
当往某些溶液中加入一定量的酸和碱时,有阻碍溶液pH变化的作用,称为缓冲作用,这样的溶液叫做缓冲溶液。弱酸及其盐的混合溶液(如HAc与NaAc),弱碱及其盐的混合溶液(如NH3·H2O与NH4Cl)等都是缓冲溶液。
由弱酸HA及其盐NaA所组成的缓冲溶液对酸的缓冲作用,是由于溶液中存在足够量的碱A-的缘故。当向这种溶液中加入一定量的强酸时,H 离子基本上被A-离子消耗:
所以溶液的pH值几乎不变;当加入一定量强碱时,溶液中存在的弱酸HA消耗OH-离子而阻碍pH的变化。
Many important reactions in chemistry and biochemistry are pH-dependent, meaning that the pH of the solution can play an important role in determining whether and how rapidly a reaction takes place. Consequently, buffers---solutions that help keep the pH stable---are important for running many experiments. Sodium acetate is a weakly basic salt and the conjugate base of acetic acid, or vinegar. A mixture of sodium acetate and acetic acid makes a good buffer for weakly acidic solutions. A few different ways exist to prepare an acetate buffer, but one method in particular is straightforward and relatively safe.
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