Do 200g, 20% roztworu wodorotlenku sodu dodano 50g wody i 20g stałego wodorotlenku sodu. Oblicz C% otrzymanego roztworu.
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mr1=200g Cp1=20% mw dod=50g ms dod=20g Cp2=?
ms1=mr1*Cp1/100%
ms1=40g
ms2=ms1+ms dod
ms2=60g
mr2=mr1+ms dod +mw dod
mr2=270g
Cp2=60g*100%/270g
Cp2=22,2%