Question

50 g solutie de NaOH de c=20% reacționează cu H2SO4 de c=49%. Ce cantitate de H2SO4 pur si de solutie de H2So4 s-a consumat. Ce produsi rezulta si in ce cantitate ?

Answer 1

Cp=md/ms*100==>md=Cp*ms/100=20*50/100=10g NaOH

80g............98g..............142g...........36g
2NaOH + H2SO4 ---> Na2SO4 + 2H2O
10g.......x=12.25g......y=17.75g.........z=4.5g

Cp=md/ms*100; 49=12.25/ms*100==>ms=1225/49=25g sol. H2SO4

n=m/M=17.75/142=0.125 moli Na2SO4

n=m/M=4.5/18=0.25 moli H2O

MH2SO4=98g/mol
MNaOH=40g/mol
MH2O=18g/mol