KOH + HCl -> KCl + H2O
ro = m/V , stim: V=100cm^3, ro = 1.24 g/cmc
m=ro*V=1.24*100 = 124 g KOH
100 g solutie KOH ... 26 g KOH
124 g solutie KOH ... x g KOH
x=32.24 g KOH
M KOH = 56 g/mol => avem 32.24/56 moli KOH = 0.575 moli KOH
conf. reactioe 1 mol KOH reactioneaza cu 1 moli HCl
=> 0.575 moli KOH reactioneaza cu 0.575 moli HCl
MHCl = 36.5 g/mol => 0.575 moli HCl = 0.575*36.5 g = 21 g HCl
concentracie de 10%:
100 g solutie HCl ... 10 g HCl
y g solutie HCl ... 21 g HCl
y=210 g acid clorhidric de conc. 10% este necesara