论文部分内容阅读
题目水泥是重要的建筑材料。水泥熟料的主要成分为CaO、SiO_2,并含有一定量的铁、铝和镁等金属的氧化物。实验室测定水泥样品中钙含量的过程如图1所示:图1回答下列问题:(1)在分解水泥样品过程中,以盐酸为溶剂,氯化铵为助溶剂,还需加入几滴硝酸。加入硝酸的目的是____,还可使用____代替硝酸。(2)沉淀A的主要成分是____,其不溶于强酸但可与一种弱酸反应,该反应的化学方程式为____。
Title Cement is an important building material. The main components of cement clinker CaO, SiO_2, and contains a certain amount of iron, aluminum and magnesium and other metal oxides. The process of laboratory determination of calcium content in cement samples is shown in Figure 1. Figure 1 answers the following questions: (1) In the process of decomposition of cement samples, using hydrochloric acid as solvent and ammonium chloride as cosolvent, a few drops of nitric acid . The purpose of adding nitric acid is ____, but it is also possible to use ____ instead of nitric acid. (2) The main component of precipitation A is ____, which is insoluble in strong acid but can react with a weak acid. The chemical equation of the reaction is ____.