（8）溶液组成的定量表示—2021-2022学年化学鲁教版九年级上册同步课时作业
※题型：单选题※知识点：单选题※试题难度：容易<br>现有20℃时一定质量的氯化钠饱和溶液,如果在该饱和溶液中加入少量的硝酸钾晶体,经搅拌振荡后,溶液中氯化钠的质量分数将( )<br>A.增大 B.减小 C.不变 D.无法确定<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/31b15bd9f69744da9e9f5b36644b9cea/76900E09FAB5EBA344B8EA84E844FF07.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/1954780b49cd4e0d8a42d77fb6b0326f/26799F43E2593E37C11414FBBB180207.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>向盛有5g氢氧化钠固体的烧杯中加入45g水,完全溶解后,所得溶液的溶质质量分数是( )<br>A.20% B.11.1% C.10% D.5%<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/3a2a1c727c8545c5b177cc2f37446cbb/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/d6a986f2b5fb43a3b8ed8f28557b2ec6/DACA022B202E73DA52395C8179CC922C.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>在其他条件不改变的情况下,对下列四种溶液作对应的处理,最终所得溶液的溶质质量分数一定变大的是( )<br>A.<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/22/51CB0A265184F2D89F61CA09FFBE46B3.png"><br>B.<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/22/1A7754BF0F3C4FC7D1E91EC9E96D072F.png"><br>C.<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/22/F40F249CCDAE1480D6158545E2718D48.png"><br>D.<img src="https://picture2.zhihuicn.com/testImage/2/2021/6/22/E85957B5DDAD8DF6BF30CF74100AB1E2.png"><br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/15d8b29d24f24601858f6140aeff6bef/E7F0EDF83F40244C8F0C84B97471AED6.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/9a0cf692e5b04d219ce1c031b7782f95/289B9F6CC5951BCA9A12605E5586CBB8.png"><br><br>※题型：单选题※知识点：单选题※试题难度：中等<br>将200g溶质质量分数为10%的蔗糖溶液,浓缩成溶质质量分数为20%的蔗糖溶液,需蒸发水的质量为( )<br>A.90g B.150g C.100g D.80g<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/cbef7d15f80f49c48661232778c50d0a/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/589aa0d3592947fbad98b5d8085eec6d/E316CE49A9639B9FABCD193D825B3D88.png"><br><br>※题型：单选题※知识点：单选题※试题难度：较易<br>将溶液的溶质质量分数提高一倍,下列做法能达到目的的是( )<br>A.向100g溶质质量分数为10%的氯化钠溶液中加入10g氯化钠,完全溶解<br>B.把100g溶质质量分数为10%的稀盐酸蒸发掉50g水<br>C.向100g5%的蔗糖水中加入100g15%的蔗糖水<br>D.向20%的硝酸钾溶液中加入10g硝酸钾和40g水<br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/a48442726fe9458680486406e9b7364e/06CA09E70C17EF8BA2D3B8C70D693953.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/1258735cf2d345ef9d20ec75e0c0b798/121E0D32B36D4FE956C2E4DDBE90C441.png"><br><br>※题型：填空题※知识点：填空题※试题难度：中等<br>℃时,将<br>12g<br>硝酸钾溶于<br>48g<br>水中,其溶质质量分数为<br>_<br>_______<br>。将此溶液分为三等份:<br>(<br>)取第一份溶液,将温度升高<br>℃(无水分损失),所得溶液中溶质质量分数为<br>_<br>_______<br>(<br>)取第二份溶液,使其溶质质量分数变为原来的<br>倍,需加入硝酸钾固体多少克?<br>(<br>)<br>取第三份<br>溶液,使其溶质质量分数变为原来的一半,需加水多少克?<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/9af3ecc84177458f88c87a10428e8100/46E924AB0870733BF86538284640D40B.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/03dbf9ae5df94fdb8a11c2c8a3157da8/4CDB42C58E157A392AB285D2CFCBC8A2.png"><br><br>※题型：填空题※知识点：填空题※试题难度：中等<br>碘酒的溶质质量分数为<br>2%<br>,如何配制<br>20g<br>这种碘酒?已知酒精的密度是<br><img src="https://picture2.zhihuicn.com/testImage/2/2021/6/22/06B1BF4D38B5F147B7462134BE50CF20.png"><br>按实验的顺序填写下列空白处。<br>(<br>)计算:计算配制<br>200g<br>溶质质量分数为<br>2%<br>的碘酒所需碘和酒精的质量。通过计算,需要碘<br>_<br>______<br>g<br>酒精<br>_<br>______<br>g<br>,酒精的体积为<br>_<br>______<br>(<br>)<br>_<br>______<br>:用<br>_<br>______<br>称量所需碘的质量,倒入<br>_<br>______<br>中,用量筒量取所需酒精的体积,倒入盛有碘的烧杯里。<br>(<br>)<br>_<br>______<br>:<br>用<br>_<br>______<br>搅拌。这样得到的溶液记为<br>200g2<br>%<br>的碘酒。<br>(<br>)装瓶存放、贴标签:把配制好的溶液放入试剂瓶中,塞好瓶塞并贴好标签。<br><br>答案<br><img src="https://picture2.zhihuicn.com/answer/2/5/2021/a89c05d720404bda9308fac70b8dfa4a/99CCEFC844CE6ADE7EBF31130384FC6F.png"><br>解析<br><img src="https://picture2.zhihuicn.com/explain/2/5/2021/fc524298315f46408365c424514b8e4d/8E93C4A7E4360F93E8300661DD2B5E55.png"><br><br>
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