Calculate the pH of each of the following solutions.

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Calculate the pH of each of the following solutions.
(a) 0.13 M KNO2
_______
(b) 0.43 M NaOCl
_______
(c) 0.36 M NH4ClO4
_______

查,NO2-,OCl-,NH4+的解离常数,计算.如果查不到,可以查相应酸的Ka或碱的Kb值,用水的离子积去除以Ka或Kb即得.
由NO2-+H2O=OH-+HNO2,
忽略水的电离
[OH]^2/[NO2-]=K
NO2-=0.13
求[OH-],求【H】.
注意有时不能忽略水的解离,不能简化计算.详见分析化学相关资料.

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