设废水样品中硫酸的质量为x
H 2SO 4+2NaOH=Na 2SO 4+2H 2O
982×40
x 40g×2%
98
x =
2×40
40g×2%
x=0.98g
废水中硫酸的质量分数=
0.98g
138g-40g ×100%=1%.
答:废水中硫酸的质量分数1%.
设废水样品中硫酸的质量为x
H 2SO 4+2NaOH=Na 2SO 4+2H 2O
982×40
x 40g×2%
98
x =
2×40
40g×2%
x=0.98g
废水中硫酸的质量分数=
0.98g
138g-40g ×100%=1%.
答:废水中硫酸的质量分数1%.