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d roztworu - 1,16 g/cm³
cp roztworu - 17,1 %
m roztworu:
m = V × d
m = 100 cm³ × 1,16 g/cm³
m = 116 g
100 % - 116g
17,1% - x
x = 17,1% × 116g/ 100 %
x = 19,8 g
Otrzymamy 19,8 g KOH.