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金虫 (小有名气)

[求助] PH计算求解

请问一下各位虫友,下列的PH怎么算?
1)0.5mol/L的柠檬酸和2mol/L氨的水溶液的pH值是多少?
2)如果用NaOH和柠檬酸的混合液(柠檬酸浓度仍为0.5mol/L)配制相同pH值的混合溶液,NaOH的浓度为多少?
3)如果氨的浓度为5mol/L呢?

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