Question

向200克20%的氯化鈉溶液中加入100克水，求所得溶液的溶質(zhì)質(zhì)量分?jǐn)?shù)為多少？

Answer 1

考點(diǎn)：有關(guān)溶質(zhì)質(zhì)量分?jǐn)?shù)的簡(jiǎn)單計(jì)算

專(zhuān)題：溶液的組成及溶質(zhì)質(zhì)量分?jǐn)?shù)的計(jì)算

分析：根據(jù)溶質(zhì)質(zhì)量分?jǐn)?shù)

溶質(zhì)質(zhì)量

溶液質(zhì)量

×100%，結(jié)合題意進(jìn)行分析解答．

解答：解：向200克溶質(zhì)質(zhì)量分?jǐn)?shù)為20%的硝酸鉀溶液中加入100克水，則所得溶液的溶質(zhì)質(zhì)量分?jǐn)?shù)

200g×20%

200g+100g

×100%≈13.3%．
答：所得溶液的溶質(zhì)質(zhì)量分?jǐn)?shù)為13.3%．

點(diǎn)評(píng)：本題難度不大，掌握溶質(zhì)質(zhì)量分?jǐn)?shù)的有關(guān)計(jì)算并能靈活運(yùn)用是正確解答本題的關(guān)鍵