Question

Otetul (acidul acetic CH3COOH) obtinut prin fermentatie se comercializeaza la o concentratie de 9% (ro=1,011g/ml). Determina concentratia molara a otetului​

Answer 1

concentratia molara se exprima prin numarul de moli de acid din  1l(1000ml) solutie

M,CH3COOH= 60g/mol

c=9%, inseamna ca in 1oog sol.sunt 9g otet

sau, din ro=m/v--> v=100g/1,011g/mol=98,9 ml

deci in 98,9ml sol...........9g otet

      1000ml....................x=m=91g,CH3COOH

niu,CH3COOH= m/M= 91g/60g/mol=1,52mol----> c,m= 1,52M