Question

7,4 g acid monocarboxilic saturat, A, reactioneaza cu 100 cm3 solutie de NaOH de concentratie 1 M. Se cere:
a) determina formula moleculara a acidului carboxilic, A;
b) scrie ecuatiile reactiilor chimice date de acidul A cu Fe si Al(OH)3;
c) scrie formula de structura a omologului inferior al acidului A.

Answer 1

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