Question

5克膽礬完全溶解在50克水中，所得溶液的質(zhì)量分?jǐn)?shù)是多少？

Answer 1

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

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

分析：膽礬是五水合硫酸銅的俗稱，溶于水所得溶液中的溶質(zhì)是硫酸銅，據(jù)此結(jié)合溶質(zhì)質(zhì)量分?jǐn)?shù)=

溶質(zhì)質(zhì)量

溶液質(zhì)量

×100%，進(jìn)行分析解答．

解答：解：膽礬是五水合硫酸銅的俗稱，5克膽礬中含CuSO₄的質(zhì)量為：5g×

160

160+18×5

×100%=3.2g．
所得溶液的質(zhì)量分?jǐn)?shù)是

3.2g

5g+50g

×100%≈5.8%．
答：所得溶液的質(zhì)量分?jǐn)?shù)是5.8%．

點(diǎn)評(píng)：本題難度不大，掌握溶質(zhì)質(zhì)量分?jǐn)?shù)=

溶質(zhì)質(zhì)量

溶液質(zhì)量

×100%并能靈活運(yùn)用是正確解答本題的關(guān)鍵．