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c(p) = 25%
m(s) = ?
200g r - 100%
x g s - 25%
x = 25%*200g / 100% = 50g - masa potrzebnej ilości soli kuchennej
m(rozp) = ? [czyli m(wody)]
m(rozp) = m(r) - m(s) = 200g - 50g = 150g
25g soli----100g roztworu
xg soli------200g roztworu
x=50g soli kuchennej
200g roztworu - 50g soli = 150g wody
Należy użyć 50g soli i 150g wody