能证明碳酸的酸性比硅酸强的事实是A.二氧化碳溶于水生成碳酸,二

能证明碳酸的酸性比硅酸强的事实是

A.二氧化碳溶于水生成碳酸,二氧化硅不溶于水也不能跟水直接反应生成硅酸

B.在高温条件下,二氧化硅跟碳酸钠反应,生成硅酸钠和二氧化碳

C.二氧化硅的熔点比二氧化碳高

D.二氧化碳通入Na2SiO3稀溶液中,生成白色胶状沉淀

答案

解析:D选项是较强的酸与较弱酸的盐溶液反应生成较强酸的盐和较弱的酸的复分解反应,这是该类复分解反应发生的条件。B选项是酸性氧化物与盐反应,而不是酸与碱反应,并且它是在高温下进行的熔融反应,由于CO2 气体逸出才使得此反应进行。这与我们平常讲的复分解反应条件不同。

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