下表是五种银盐的溶度积常数(25 ℃): 化学式AgClAg2SO4Ag2SAgBrAgI 溶度

下表是五种银盐的溶度积常数(25 ℃)

化学式

AgCl

Ag2SO4

Ag2S

AgBr

AgI

溶度积

1.8×1010

1.4×105

6.3×1050

7.7×1013

8.51×1016

下列说法不正确的是(  )

A.五种物质在常温下溶解度最大的是Ag2SO4

B.将氯化银置于水中,向其中加入Na2S,则可以生成黑色沉淀

C.氯化银、溴化银和碘化银三种物质在常温下的溶解度随着氯、溴、碘的顺序增大

D.沉淀溶解平衡的建立是有条件的,外界条件改变时,平衡也会发生移动

答案

解析 由五种物质的溶度积可大约求得各自的c(Ag),可比较溶解度,A项正确,C项错;由于Ksp(Ag2S)Ksp(AgCl),所以AgCl能转化为Ag2S沉淀,B项正确;沉淀溶解平衡是化学平衡的一种,条件改变,平衡会发生移动,D项正确。

答案 C

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