一、为什么实验室选用大理石或石灰石制取二氧化碳?答:大理石或石灰石的主要成分是碳酸钙.碳酸盐跟酸起反应,一般都有二氧化碳生成.若选用可溶性的碳酸盐,如常见的Na2CO3、K2CO3等,与酸反应速度过快,难以控制;若选 1. Why does the laboratory use marble or limestone to make carbon dioxide? A: The main component of marble or limestone is calcium carbonate. Carbonate reacts with acid and generally produces carbon dioxide. If soluble carbonates are used, such as common Na2CO3, K2CO3, etc., and the acid reaction rate is too fast, difficult to control;