se afla md sol. de NaOH
md=c.ms : 100
md=20.200 : 100=40g NaOH
40g xg
NaOH + HCl =NaCl + H2O
40g 36,5g
x=36,5 .40 :40=36,5 g HCl [ md pentru sol. de HCl ]
se afla ms HCl
ms=md.100 : c
ms=36,5 .100 : 20=182,5 g sol. HCl
se afla volumul sol. de HCl
ro=ms : Vs
Vs= ms : ro
182,5g=0,1825 kg
V=0,1825 kg : 1,1 kg/cm³=0,165 cm³ HCl
MNaOH=23+16+1=40----->1mol=40g
MHCl=1+ 35,5=36,5 -----> 1mol=36,5g