以粗盐为原料提纯氯化钠的问题探讨  

Discussion on Problems about Purification of Crude Salt

作　　者：刘志红[1] 余燕艳 

机构地区：[1]长春医学高等专科学校,吉林长春130031 [2]长春市第十七中学,吉林长春130021

出　　处：《化学教育》2015年第4期68-70,共3页Chinese Journal of Chemical Education

摘　　要：为培养学生的创新性思维和实验探究能力,师生共同探讨＂以粗盐为原料提纯氯化钠＂实验的几个问题。分离和提纯物质都是除掉杂质吗？煅炒粗盐时,为什么会发生轻微的爆炸现象？沉淀法除去SO^2-4、Ca^2＋等杂质时,盐水一定要煮沸吗？为除去过量的Na2CO3,溶液的pH应该控制在什么范围？In order to cultivate students′creative thinking and experimental ability,several questions about purification of crude salt were discussed.Can both separation and purification get rid of impurities？Why is there a slight explosion when frying crude salt？Must the salt solution be boiled when removing impurities like SO^2-4,Ca^2＋by method of precipitation？What range should the pH of the solution be kept so that excessive Na2CO3 can be removed？

关 键 词：粗盐 氯化钠 分离 提纯 实验改进 

分 类 号：G633.8[文化科学—教育学]