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【简答题】
（10分）海水是巨大的资源宝库。如下图所示利用海水为原料可获得许多化工产品： （1）要鉴别海水是硬水还是软水，可选用的试剂是 ； （2）步骤①中选用蒸发结晶法而不用降温结晶法的理由是 ； （3）制纯碱过程中，其中过滤操作所需要的玻璃仪器有烧杯、漏斗和 ； （4）步骤②发生反应的化学方程式是 ，其基本反应类型为 （选填“化合”、“分解”、“置换”或“复分解”）反应； （5）步骤④发生的反应为置换反应（类似于金属与盐溶液之间的反应），试写出该反应的化学方程式 。
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