R+45. 1mol
R-COOH + NaOH -> R-COONa + H2O
7,4 g. 0,1moli
R+45=74=> R=29 => R=CnH2n+1=> 14+1=29 => 14n=28=> n=2 => CH3-CH2-COOH si formula moleculara C3H6O2.
b) 2CH3-CH2-COOH + Fe -> (CH3-CH2-COO)2Fe + H2
3CH3-CH2-COOH + Al(OH)3 -> (CH3-CH2-COO)3Al + 3H2O
C) CH3-COOH