小刚同学在进行酸碱中和反应的实验时�盛有氢氧化钠溶液的烧杯中逐滴加入稀硫酸滴加一会儿后�现没有预先�氢氧化钠溶液中滴入酚酞溶液因而无法 Template




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tomski小刚同学在进行酸碱中和反应的实验时�盛有氢氧化钠溶液的烧杯中逐滴加入稀硫酸滴加一会儿后�现没有预先�氢氧化钠溶液中滴入酚酞溶液因而无法 coloring