-calculez moli NaOH din solutie
c=n/V, 0,5= n,mol/0,8 l-----------------> n= 0,4mol NaOH
-calculez moli acid reactionati cu 0,4mol baza
1MOL 1MOL
NaOH+CH3COOH---> CH3COONa+H2O
O,4mol ........0,4mol
-calculez concentratia molara a solutiei de acid
c=n/V---> c= 0,4mol/ 0,2 l= 2M