Question

例4:20℃时,将5克硝酸钾放入40克水中,完全溶解,所得硝酸钾溶液的质量分数是 %.问下列各自操作后所得

Answer 1

5/(5+40)=11.1%

(1)(5+5)/(5+5+40)=50%

(2)5/(5+40-10)=14.3%

(3)(5+5)/(5+5+40+20)=14.3%

(4)5/(5+40+10)=9.1%

(5)(5+50*20%)/(45+50)=15.8%

氯化钠饱和溶液中的溶质质量分数=36/(100+36)=26.5%