c(N0048)相同的下列溶液①NH4Cl②(NH4)2SO4③NH4HSO4④NH4HCO3,其物质的

c(N0048)相同的下列溶液①NH4Cl②(NH4)2SO4③NH4HSO4④NH4HCO3,其物质的量浓度由大到小的顺序是()

A.②④①③

B.②③①④

C.①④③②

D.④①③②

答案

D


解析:

①③④相比,由于④中NH水解得到促进,水解程度大于①,③中水解受到抑制,c(NH)水解程度小于①,故这三份溶液中如果c(NH)相等,必然有④>①>③的关系,而②中(NH4)2SO4物质的量浓度与③相比,当二者浓度相等时,②中c(NH+4)接近③的2倍,若c(NH)相等时,必然(NH4)2SO4浓度接近NH4HSO4浓度的二分之一。

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