1.n(HCl)=33.6/22.4=1.5mol
C(HCl)=1.5mol/3L=0.5mol/L
2.n(NaOH)=1.5mol/L*1L=1.5mol
m(NaOH)=1.5*40=60g
3.若将这50mL溶液?浓度呢?