A.c(CH3COOH) | B.c(H+) |
C. | D. |
弱酸 | CH3COOH | HCN | H2CO3 |
电离平衡常数 | 1.8×l0-5 | 4.9×l0-10 | K1=4.3×l0-7 K2=5.6×l0-11 |
A.室温时,NaR溶液的pH大于7 |
B.滴加紫色石蕊试液,溶液变红色 |
C.HR溶液加入少量NaR固体,溶解后溶液的pH变大 |
D.室温时,0.01mol•L—1的HR溶液pH=4 |
A.①③④ | B.②③④ | C.③④⑤ | D.②⑤ |
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