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cp₁ - 15%
ms₁=?
ms₁/mr₁=cp₁/100%
ms= (80g. *15%) /100%
ms₁ = 12g.
mr₁=ms₁+mrp₁
mrp₁=mr₁-ms₁
mrp₁= 80g-12g
mrp₁=68g
mrp₂= 68g+20g
mrp₂=88g
ms₂=ms₁
mr₂=mrp₂+ms₂
mr₂=88g+12g
mr₂=100g
ms₂/mr₂=cp₂*100%
cp₂= (ms₂*100%):mr₂
cp₂= (12g*100%):100g
cp₂=1200:100 [%]
cp₂ = 12%
Odp. Stężenie drugiego roztworu wynosi 12%
zad.2
mr=800g
cp=2%
ms=?
ms/mr=cp/100%
ms=(mr*cp):100%
ms=(800g*2%):100%
ms=16g.
Odp. Pozostanie 16g soli.