论文部分内容阅读
笔者2014年参加“初中化学教师实验技能操作比赛”中准备练习中,对粗盐提纯得出的体会,提高粗盐提纯产率的做法:(1)把大块粗盐用研钵研细,加快粗盐溶解.(2)过滤时对粗盐溶液静置,同时注意过滤事项加快过滤.(3)对滤液加热,掌握好火候,提高粗盐的产率.(4)改变称量方法,得出准确的粗盐提纯产率.
The author participated in the “junior high school chemistry teacher experimental skills operation competition” in the preparatory practice, the crude salt purification derived from the experience to improve crude salt purification yield practices: (1) large coarse salt with mortar research Fine, speed up the dissolution of coarse salt. (2) When the filter on the crude salt solution is allowed to stand, while paying attention to the filter to speed up the filter. (3) The filtrate heating, good heat, improve crude salt yield. (4) Method, derived accurate crude salt purification yield.