Question

73克10%的鹽酸與80克氫氧化鈉溶液恰好完全反應(yīng)．求NaOH溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)和所得溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)．

Answer 1

設(shè)NaOH質(zhì)量為x，生成NaCl的質(zhì)量為y
NaOH+HCl=NaCl+H₂O
40      36.5   58.5
x      73g×10%  y

40

x

=

36.5

73g×10%

=

58.5

y

x=8g；y=11.7g
NaOH溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)為NaOH%=

8g

80g

×100%=10%
NaCl溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)為NaCl%=

11.7g

73g+80g

×100%=7.6%
答：NaOH溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)為10%；
NaCl溶液中溶質(zhì)的質(zhì)量分?jǐn)?shù)為7.6%．