將126g碳酸鈉飽和溶液與73g質(zhì)量分?jǐn)?shù)是10％的鹽酸恰好反應(yīng).試計(jì)算反應(yīng)后所得溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù).

化學(xué)人氣：594 ℃時(shí)間：2020-03-30 20:53:54

優(yōu)質(zhì)解答

73g質(zhì)量分?jǐn)?shù)是10％的鹽酸溶質(zhì)質(zhì)量是73*10%=7.3g
設(shè)反應(yīng)生成NaCl的質(zhì)量為x,生成CO2的質(zhì)量為y.
Na2CO3+2HCl=2NaCl+H2O+CO2↑
73 117 44
7.3g x y
73/7.3=117/x=44/y
x=11.7g
y=4.4g
反應(yīng)后溶液質(zhì)量是126+73-4.4=194.6g
溶質(zhì)質(zhì)量分?jǐn)?shù)是11.7/194.6*100%=6%
答：反應(yīng)后所得溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)是6%