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2018年中考化学真题分类汇编2我们身边的物质考点14酸碱盐和氧化物7中和反应计算题（无答案）.doc

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1酸碱盐和氧化物（18 甘肃）18 （6 分）用溶质质量分数为5%的 NaOH 溶液中和 73g 的稀盐酸，反应过程中溶液的酸破度变化如下图所示。请计算(1）用质量分数为 10的氢氧化钠溶液配制 5的氢氧化钠溶液 100g，需要水 克.（2）当 a 为 80g 时，所得溶液中溶质的质量分数是多少（结果精确到 0.1%）?

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