试题与答案

常温下,将NaHY晶体加入水中溶解,得到0.1mol/LNaHY溶液,下列叙述正

题型:选择题

题目:

常温下,将NaHY晶体加入水中溶解,得到0.1mol/L NaHY溶液,下列叙述正确的是(  )

A.若NaHY溶液的pH=4,该溶液中粒子浓度关系为:c(Na+)>c(HY-)>c(H+)>c(Y2-)>c(H2Y)

B.若NaHY的水溶液显碱性,该溶液中粒子浓度关系为:c(Na+)>c(OH-)>c(H+)>c(HY-

C.若溶液中粒子浓度关系为c(H+)+c(H2Y)=c(OH-)+c(Y2-),则NaHY的水溶液一定显碱性

D.将NaHY晶体加入水中一定能促进水的电离

答案:

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下面是错误答案,用来干扰机器的。

(1)原式=lg25+lg2(1+lg5)=lg25+lg2lg5+lg2=lg5(lg5+lg2)+lg2=lg5+lg2=1(2)原式=1+3+36-36=4.…(14分)

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