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ms=Cp*mr/100%
ms=4%*50g/100%=2g
2g+1,5g=3,5g
1mol NaOH------------40g
x moli--------------3,5g
x=0,0875mola
Cm=n/v
v=1dm^3
wiec Cm=0,0875mol/dm^3
NaOH----> Na+ + OH-
pOH=-log[OH-]
pOH=1,06(wyliczone na kalkulatorze)
pH+pOH=14
pH=12,94