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明矾可用于净水,是因为明矾溶于水生成的胶状物可以______悬浮于水中的杂质,使水澄清;除去水中难溶性的固体杂质可以采用______操作;新型自来水消毒剂ClO2可由下列反应制取:Cl2+2X═2NaCl+2ClO2,则X的化学是为______;除去硬水中过多的______(填离子符号)和Mg2+就可得到软水;除去水壶内壁的水垢时,可用厨房调料______洗去.
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