题目：
在常温下的下列溶液中，有关说法正确的是
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A．将pH =b的氨水稀释10倍后，溶液的pH =b -1
B．将碳酸钠溶液加热蒸发，恢复原温度时，溶液的pH一定增大
C．在Na2S溶液中一定存在：c(Na+)=2[c(S2-)+c(HS-)+ c(H2S)]
D．pH =2的盐酸与pH =12的氨水等体积混合后，pH <7
答案：
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