下列物质的电离方程式，正确的是（ ）
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| A． | 加热NH4HCO3至熔融状态：NH4HCO3═NH4++HCO3‑ |
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| B． | CO2通入水中得到H2CO3：H2CO3═2H++CO32‑ |
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| C． | 醋酸钠溶于水：CH3COONa═CH3COO﹣+Na+ |
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| D． | C2H5OH溶于水：C2H5OH═C2H5++OH﹣ |
下列物质的电离方程式，正确的是（ ）
|
| A． | 加热NH4HCO3至熔融状态：NH4HCO3═NH4++HCO3‑ |
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| B． | CO2通入水中得到H2CO3：H2CO3═2H++CO32‑ |
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| C． | 醋酸钠溶于水：CH3COONa═CH3COO﹣+Na+ |
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| D． | C2H5OH溶于水：C2H5OH═C2H5++OH﹣ |
考点：
电离方程式的书写．
分析：
A．碳酸氢铵不稳定受热分解；
B．多元弱酸分步电离；
C．醋酸钠为强电解质，完全电离；
D．乙醇为非电解质．
解答：
解：A．碳酸氢铵不稳定受热分解，故A错误；
B．碳酸为多元弱酸分步电离，电离方程式为：H2CO3 png_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H++HCO3‑，HCO3‑png_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H++CO32‑，故B错误；
C．醋酸钠溶于水，完全电离，电离方程式：CH3COONa═CH3COO﹣+Na+，故C正确；
D．乙醇为非电解质，不能电离，故D错误；
故选：C．
点评：
本题考查了电离方程式的书写，明确电解质的强弱及电离方程式的书写规则是解本题关键，题目难度不大．