Question

將50g20%的硝酸鉀溶液稀釋到200g，稀釋后所得溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)是（ ）
A．20%
B．10%
C．5%
D．1%

Answer 1

【答案】分析：根據(jù)稀釋前后溶液中溶質(zhì)質(zhì)量不變及溶液中溶質(zhì)質(zhì)量分析計(jì)算公式：溶液的溶質(zhì)質(zhì)量分?jǐn)?shù)=×100%，進(jìn)行計(jì)算．
解答：解：稀釋后200g溶液中溶質(zhì)質(zhì)量=50g×20%=10g
則稀釋后所得溶液的溶質(zhì)質(zhì)量分?jǐn)?shù)=×100%=5%
故選C
點(diǎn)評(píng)：本題為溶液稀釋類問題的基本計(jì)算，主要利用溶液加水稀釋前后溶質(zhì)質(zhì)量不變進(jìn)行問題的分析與解決．