(1)20g氢氧化钠溶液中溶质的质量是:20g×10%=2g
(2)设100g食醋中含醋酸的质量为x
CH3C0OH+NaOH═CH3COONa+H20
60 40
x 2g
[60/40=
x
2g]
x=3g
所以食醋中醋酸的质量分数为
3g
100g×100%=3%
答:20g氢氧化钠溶液中溶质的质量为2g;食醋中醋酸的质量分数为3%.
(1)20g氢氧化钠溶液中溶质的质量是:20g×10%=2g
(2)设100g食醋中含醋酸的质量为x
CH3C0OH+NaOH═CH3COONa+H20
60 40
x 2g
[60/40=
x
2g]
x=3g
所以食醋中醋酸的质量分数为
3g
100g×100%=3%
答:20g氢氧化钠溶液中溶质的质量为2g;食醋中醋酸的质量分数为3%.