Oblicz jakie jest stężenie procentowe roztworu jeżeli do 400 gramów czterdziesto procentowego roztworu dolano 500 g. wody i dosypano 100 g. soli .
ze wzoru : Cp = ms/mr razy 100 %
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mr = 400g
cp = 40%
ms = cp x mr/100%
ms = 400g x 40%/100% = 160g
ms₂ = 160g + 100g = 260g
mr₂ = 400g + 100g + 500g = 1000g
cp = ms x 100%/mr
cp₂ = 260g x 100%/1000g = 26%
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