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（ 2010 · 辽宁鞍山， 22 ）某兴趣小组在学习碱的化学性质时，进行了如图所示的实验。 (1) 写出甲实验中盐酸和氢氧化钠反应的化学方程式 。 (2) 乙实验中滴加氢氧化钠溶液后，可观察到的现象是 。 (3) 丙实验中观察到试管内有白色沉淀产生。 (4) 实验结束后，同学们将甲、乙、丙三个实验的废液倒人同一个子净的废液缸中，最终 看到废液浑浊并呈红色，由此产生疑问。 【提出问题】废液中含有哪些物质 ? 【交流讨论】①一定含有的物质：碳酸钙、指示剂、 。 ②还含有能使废液呈碱性的物质。能使废液呈碱性的物质是什么 ? 同学们有如下猜想。 小兰认为：只有碳酸钠 小刚认为：只有氢氧化钙 认为：是氢氧化钠和碳酸钠 你认为还可能是 。 ( 写一种猜想 ) 【实验设计】小斌想用氯化钙溶液来验证小兰、小刚、的猜想。查阅资料获悉氯化 钙溶液呈中性，并设计如下实验。请你将小斌的实验设计补充完整。 【反思拓展】在分析化学反应后所得物质的成分时，除了考虑生成物外还需考虑 。
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