NaOH+HCl= NaCl+H2O
40 36.5 18
4g x y 解得x=3.65g ,y=1.8g(第二问用)
∴w=3.65g/20g×100%=18.25%
(2)w=NaCl/V=3.65g+4g-1.8g/20g-3.65g+1.8g×100%≈32.2%
NaOH+HCl= NaCl+H2O
40 36.5 18
4g x y 解得x=3.65g ,y=1.8g(第二问用)
∴w=3.65g/20g×100%=18.25%
(2)w=NaCl/V=3.65g+4g-1.8g/20g-3.65g+1.8g×100%≈32.2%