将3.3 g CO2通入含3.7 g Ca(OH)2的澄清石灰水中(假设全部反应),可得

将3.3 g CO2通入含3.7 g Ca(OH)2的澄清石灰水中(假设全部反应),可得沉淀(    )

A.7.5 g                B.5 g                  C.2.5 g                   D.0.5 g

答案

C

解析:由所给反应物质量可得:n(CO2)∶n〔Ca(OH)2〕=3∶2

所以,CO2过量。发生如下反应:

CO2+Ca(OH)2====CaCO3↓+H2O

CO2+H2O+CaCO3====2Ca(HCO3)2

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