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问 :实验室制取二氧化碳时 ,为什么常用稀盐酸而不用稀硫酸、浓盐酸或硝酸 ?答 :制取二氧化碳时常用稀盐酸而不用稀硫酸、浓盐酸或硝酸 ,其原因是稀硫酸虽与石灰石反应 ,但反应后生成的硫酸钙微溶于水 ,会覆盖在石灰石的表面 ,阻碍反应继续进行 ;而浓盐酸具有很强的挥发性 ,使
Q: Why does the laboratory use dilute hydrochloric acid instead of dilute sulfuric acid, concentrated hydrochloric acid or nitric acid when preparing carbon dioxide from the laboratory? Answer: Dilute hydrochloric acid is often used instead of dilute sulfuric acid, concentrated hydrochloric acid or nitric acid in the preparation of carbon dioxide. The reason is that dilute sulfuric acid is related to limestone. Reaction, but calcium sulfate produced after reaction is slightly soluble in water and will cover the surface of limestone, hindering the reaction from proceeding; and concentrated hydrochloric acid has a strong volatility, so that