Question

care este Ph unei solutii apoase care contine 2,52 g de KOH in 450ml solutie?

Answer 1

-calculez moli KOH , stiind M,KOH= 56g/mol

niu=m/M= 2,52g/56g/mol= 0,045molKOH

-calculez concnetratia molara a sol KOH

C=niu/V= 0,045mol/ 0,450 l= 0,1 mol/l

-calculez:    pOH=-log[OH⁻]

[OH⁻]=[KOH= 10⁻¹---> pOH= 1

-calculez pH

pH+pOH=14---> pH= 13