1..Oblicz, ile gramów soli kamiennej należy użyć do przygotowania 250 g roztworu o stężeniu 20%
Z def. stęż. procent.
20g soli----100g roztworu
xg soli------250g roztworu
x = 50g soli
mr = 250g
c% = 20%
ms = ?
c% = ms * 100%/ mr /*mr
c% * mr = ms * 100% /:100%
ms= c% * mr/ 100%
ms = 20% * 250g / 100%
ms = 50g
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Z def. stęż. procent.
20g soli----100g roztworu
xg soli------250g roztworu
x = 50g soli
mr = 250g
c% = 20%
ms = ?
c% = ms * 100%/ mr /*mr
c% * mr = ms * 100% /:100%
ms= c% * mr/ 100%
ms = 20% * 250g / 100%
ms = 50g