A. + SO32―→+ HSO3― |
B. + SO32―→+HSO3― |
C.2+ SO32―→2+SO2↑+H2O |
D. +2SO32―→+2HSO3― |
A.K> Kw | B.K= Kw | C.K< Kw | D.无法比较 |
A.②③④① | B.②①③④ | C.③②④① | D.③②①④ |
弱酸 | HCOOH | HCN | H2CO3 |
电离平衡常数 | 1.77×l0–5 | 4.9×l0–10 | Ki1=4.3×l0–7 Ki2=5.6×l0–11 |
pH | c(CrO42—) | c(HCrO4—) | c(Cr2O72—) | c(H2CrO4) |
4 | 0.0003 | 0.1040 | 0.4480 | 0 |
6 | 0.0319 | 0.0999 | 0.4370 | 0 |
7 | 0.2745 | 0.0860 | 0.3195 | 0 |
9 | 0.9960 | 0.0031 | 0.0004 | 0 |
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