已知醋酸铵溶液约为中性,又知醋酸加入碳酸钠溶液中有气体放出,

已知醋酸铵溶液约为中性,又知醋酸加入碳酸钠溶液中有气体放出,试推断碳酸氢铵溶液的pH是大于、小于还是等于7?并说明理由。

   

答案

解析:因CH3COONH4溶液约为中性,故CH3COO-水解程度与水解程度相近,又向Na2CO3溶液中加CH3COOH有气体放出,可知CH3COOH酸性比碳酸强,故水解程度比CH3COO-水解程度大,水解程度比水解程度大,故NH4HCO3溶液呈碱性,即pH>7。

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