Răspuns:
20485.16 g H2O
Explicație:
ρ=m/V
m=ρ*v=49g/ml*1200ml=58800g H2CO3
C%=(md/ms)*100
md=c%*ms/100=62*58800/100=35280 g H2CO3 (care intra in reactie)
ms=58800 g (masa solutiei de acid carbonic)
2KOHG+H2CO3=K2CO3+2H20
35280 X
62 2*18
X=35280*36/62=20485.16 g