将50g20%的硝酸钾溶液稀释到200g,稀释后所得溶液中溶质的质量分数是( ) A.20% B.10% C.5% D.1%
问题描述:
将50g20%的硝酸钾溶液稀释到200g,稀释后所得溶液中溶质的质量分数是( )
A. 20%
B. 10%
C. 5%
D. 1%
答
稀释后200g溶液中溶质质量=50g×20%=10g
则稀释后所得溶液的溶质质量分数=
×100%=5%10g 200g
故选C