Question

Calculati pH-ul unei solutii(V=500 ml) ce contine 0.28g KOH.(M=56g/mol)

Answer 1

Răspuns:

-calculez moli KOH

niu=m/M= 0,28/56mol= 0,005mol

-calculez concentratia molara

c,m= niu/V=0,005/0,5 mol/l= 0,01mol/l= 10⁻²mol/l

--->pOH= -Lpg[OH⁻]= 2

---->pH+pOH=14---> pH= 12

Explicație: