| Roztwór | Masa substancjirozpuszczonej, g | Objętośćrozpuszczalnika, cm3 | Stężenie procentoweroztworu, % |
| A. | 30g | 270cm3 | 10 |
| B. | 0,5g | 49,5cm3 | 1 |
| C. | 2,4g | 99,5cm3 | 3 |
A.
mS = ?
mR = 300g
Cp = 10%
Cp =
∙ 100%
10% =
∙ 100% / ∙ 300g
3000%g = mS ∙ 100% / : 100%
mS = 30g
mrozp = mR – mS = 300g – 30g = 270g
Vrozp =
=
= 270cm3
B.
mS = ?
mR = 50g
Cp = 1%
Cp =
∙ 100%
1% =
∙ 100% / ∙ 50g
50%g = mS ∙ 100% / : 100%
mS = 0,5g
mrozp = mR – mS = 50g – 0,5g = 49,5g
Vrozp =
=
= 49,5cm3
C.
mS = ?
mR = ?
Cp = 3%
Cp =
∙ 100%
mR = 100cm3 ∙ 0,8g/cm3 = 80g
3% =
∙ 100% / ∙ 80g
240%g = mS ∙ 100% / : 100%
mS = 2,4g
mrozp = mR – mS = 80g – 2,4g = 77,6g
Vrozp =
=
= 99,5cm3
