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【简答题】
沿岸居民大多以水为生活用水。为了弄清水的水质状况，某化学兴趣小组对水质进行了相关调查。 ⑴取回水样，向浑浊的水中加明矾，静置后过滤，得到澄清的水。 ⑵若要测定水的酸碱度，最适宜的试剂或用品是 （填序号）。 A.紫色石蕊试液 B.PH试纸 C.石灰石 D.无色酚酞试液 ⑶同学们用 可判断水是硬水还是软水。 ⑷生活中常用 的方法，即可降低水的硬度，又能消毒杀菌。
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