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1g = 1000mg
5,1mg = 0,0051g
1 mol ----------17g
x mola------------ 0,0051g
x = 0,0003mola jonów OH
taka ilość jonów znajduje się w 1dm3, więc stężenie molowe wynosi 0,0003mol/dm3
pOH = -log[OH⁻] = -log(0,0003)
pOH = 3,52
pH+pOH=14
pH = 14 - pOH
pH = 14-3,52
pH = 10,48