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Dane:
Cp = 15%
mr = 80g
mH2O = 20g
Szukane:
Cp2 = ?
Wzór:
Cp = ms/mr*100%
ms = mr*Cp/100%
ms = 80*15/100%
ms = 12g sub
mr po dolaniu wody = 80+20 = 100g
Cp2 = ms/mr*100%
Cp2 = 12/100*100*
Cp2 = 12%
C% = 15%
mr = 80g
mw = 20g
Szukane:
C% ₂= ?
Wzór:
C% = ms/mr*100%
ms = mr*C%/100%
Rozwiązanie:
ms = 80*15/100%
ms = 12g
mr po dod. wody = 80+20 = 100g
C%₂ = ms/mr*100%
C%₂ = 12/100*100%
C%₂ = 12%
Liczę na najlepszą, pozdrawiam :*
m roztw. = 80g Cp₂ = ?
Cp₁ = 15%
m H₂O = 20g
Wzór:
Cp₂ = m H₂SO₄ ÷ (m roztw. + m H₂O) × 100%
m H₂SO₄ = m roztw. × Cp₁
m H₂SO₄ = 80 × 15% = 12g
Cp₂ = 12 ÷ 100 × 100% = 12%
Odp. Stężenie prcentowe otrzymanego roztworu wynosi 12%.