在氢氧化钾和氢氧化钙混合溶液中逐渐滴加二氧化碳直至过量的离子方程式
人气：183 ℃ 时间：2019-11-25 13:01:09
解答
(1)Ca^2+ + 2OH- +CO2 == CaCO3（沉淀符号） + H2O （少量）
(2)CaCO3 +CO2+H2O == Ca^2+ + 2HCO3- （过量）
(3)HCO3- + OH- == H2O+ CO3^2-
注：二三两步可以合并写
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