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关于乙酸乙酸钠缓冲溶液PH值的问题

2025-04-01 00:57:04

推荐回答（2个）

回答1：

PH=PKa-lg[HAc]/[Ac-]
以上是配制乙酸乙酸钠缓冲溶液的公式，用它可以计算出乙酸和乙酸钠的物质的量比，再计算各自的质量。
4.5=4.76-lg[HAc]/[Ac-]
lg[HAc]/[Ac-]=4.76-4.5
[HAc]/[Ac-]=1.8/1
假设所要配制的溶液的浓度是0.6摩尔/升，要配制的溶液为1升，那么
需要冰醋酸的质量是60×0.6×1.8/2.8=23.1克
需要无水醋酸钠的质量是82×0.6×1/2.8=17.6克

回答2：

先配制1mol/L HAC 、1mol/L NaAC溶液，先按1 ：1混合，再按需要调节pH。要低加HAC ，要高
加NaAC 。

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