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我们可以利用指示剂来完成，在烧杯中加入约10ml氢氧化钠溶液，滴入2～3滴酚酞溶液。再用滴管慢慢滴入稀盐酸，并边滴边不断搅拌溶液， 至溶液颜色恰好由红色变成无色为止，此时氢氧化钠与稀盐酸恰好完全反应。