1) m(NaOH)=m(раствора)*w(NaOH)=200*0.2/100=0.4 г NaOH
2) m(H2O)=m(раствора)-m(NaOH)=200-0.4=199.6 г H2O
1) m(NaOH)=m(раствора)*w(NaOH)=200*0.2/100=0.4 г NaOH
2) m(H2O)=m(раствора)-m(NaOH)=200-0.4=199.6 г H2O