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Obliczam objętość roztworu:
Vr=m/d=50[g]/1,275[g/cm3]=39,2[cm3].
0,2[mola] - 1000[cm3];
x [mola] - 39,2[cm3].
x=0,008[mola].
1[mol] NaOH - 40[g];
0,008[mola] - x[g].
x=0,32[g] NaOH.