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①用量筒量取水时仰视读数;②往烧杯中加水时有水溅出;③称量含不溶性杂质的氯化钠来配制溶液;④将配制好的溶液往试剂瓶中转移时有少量溅出.
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①用量筒量取水时仰视读数;②往烧杯中加水时有水溅出;③称量含不溶性杂质的氯化钠来配制溶液;④将配制好的溶液往试剂瓶中转移时有少量溅出.
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⑵取第二份溶液,使其溶液中质量分数变为原来的一半,需加水 g
⑶第三份溶液,使其溶质的质量分数比原来增加一倍,需加入硝酸钾 g;
⑷温度不变,分别为150g和100g的两份食盐饱和溶液,各蒸发掉10g水,析出晶体的质量分别为m1和m2 , 则m1m2(填“>”“<”“=”)
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②称量时使用生锈的砝码,则配制溶液中溶质质量分数 10%.
③称量时KNO3和砝码的位置颠倒,则配制溶液中溶质质量分数 10%
④用量筒量取水时,俯视读数,则配制溶液中溶质质量分数 10%
⑤配制完成后称取液体时有部分溅出,则配制溶液中溶质质量分数 10%
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