NaOH + HCl ---> NaCl + H2O
2 NaOH + H2SO4 ---> Na2SO4 + H2O
HCl + AgNO3 ---> AgCl + HNO3
36,5 g HCl.........170 g AgNO3
x g HCl..............6,8 g AgNO3 x = 1.46 g HCl
c%=md/ms*100=>md=68*10/100=6,8g AgNO3
m H2SO4 = 4,4 - 1,46 = 2,54 g H2SO4
40 g NaOH..........36,5 g HCl
a g NaOH.............1,46 g HCl a = 1,6 g NaOH
2*40 NaOH........98 g H2SO4
b g NaOH...........2,54 g H2SO4 b = 2,0735 g NaOH
md = a + b = 1,6+2,0735 = 3,6735 g NaOH
c%=md/ms*100=>ms=3,6735/20*100=>ms = 18,3675 g NaOH solutie