单选题 适中0.65 引用7 组卷520
25℃时,用0.0500 mol·L-1H2C2O4溶液滴定 25.00 mL0.l000mol·L-1NaOH溶液所得滴定曲线如图。下列说法正确的是
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/29/a803ce2c-87a4-4f41-bd29-4432b1729336.png?resizew=219)
A.点①所示溶液中:c(H+)+c(H2C2O4)+c(HC2O4-)=c(OH-) |
B.点②所示溶液中:c(HC2O4-)+c(C2O42-)=c(Na+) |
C.点③所示溶液中:c(Na+)>c(HC2O4-)>c(H2C2O4)>c(C2O42-) |
D.滴定过程中可能出现:c(Na+)>c(C2O42-)=c(HC2O4-)>c(H+)>c(OH-) |
2017·江苏南通·二模
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常温下,用0.10mol·L-1KOH溶液滴定10.00mL0.10mol·L-1H2C2O4(二元弱酸)溶,所得滴定曲线如图所示(混合溶液的体积可看成混合前溶液的体积之和)。下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2019/4/16/2183744312500224/2185155243376640/STEM/92be3ddc8b0641c4ac7b4c95381e1d3c.png?resizew=226)
![](https://img.xkw.com/dksih/QBM/2019/4/16/2183744312500224/2185155243376640/STEM/92be3ddc8b0641c4ac7b4c95381e1d3c.png?resizew=226)
A.点①所示溶液中:c(H+)/c(OH-)=1012 |
B.点②所示溶液中:c(K+)+c(H+)=c(HC2O4-)+c(C2O42-)+c(OH-) |
C.点③所示溶液中:c(K+)>c(HC2O4-)>c(H2C2O4)>c(C2O42-) |
D.点④所示溶液中:c(K+)+c(H2C2O4)+c(HC2O4-)+ c(C2O42-)=0.10mol·L-1 |
常温下,用0.10mol·L-1KOH溶液滴定10.00mL0.10mol·L-1H2C2O4(二元弱酸)溶,所得滴定曲线如图所示(混合溶液的体积可看成混合前溶液的体积之和)。下列说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2019/4/16/2183744312500224/2185155243376640/STEM/92be3ddc8b0641c4ac7b4c95381e1d3c.png?resizew=226)
![](https://img.xkw.com/dksih/QBM/2019/4/16/2183744312500224/2185155243376640/STEM/92be3ddc8b0641c4ac7b4c95381e1d3c.png?resizew=226)
A.点①所示溶液中:c(H+)/c(OH-)=1012 |
B.点②所示溶液中:c(K+)+c(H+)=c(HC2O4-)+c(C2O42-)+c(OH-) |
C.点③所示溶液中:c(K+)>c(HC2O4-)>c(H2C2O4)>c(C2O42-) |
D.点④所示溶液中:c(K+)+c(H2C2O4)+c(HC2O4-)+ c(C2O42-)=0.10mol·L-1 |
用0.1mol·L-1的NaOH溶液滴定25mL0.1mol·L-1的H2C2O4(草酸)溶液的滴定曲线如图所示。下列说法不正确的是
![](https://img.xkw.com/dksih/QBM/2016/11/3/1576464056664064/1576464056819712/STEM/e421df28e56b4179882a7e011e5b1383.png)
![](https://img.xkw.com/dksih/QBM/2016/11/3/1576464056664064/1576464056819712/STEM/e421df28e56b4179882a7e011e5b1383.png)
A.草酸是弱酸 |
B.X点:c(H2C2O4)+c(HC2O4-)=c(Na+)-c(C2O42-) |
C.Y点:c(H2C2O4)+c(HC2O4-)=c(OH-)-c(H+) |
D.滴定过程中始终存在:c(OH-)+2c(C2O42-)+ c(HC2O4-)= c(Na+)+ c(H+) |
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