Odpowiedzi

2009-10-11T21:04:17+02:00
Ms - masa substancji
mr - masa roztworu
mw - masa wody
Cp - stężenie procentowe

a)
ms = 40g
mw - 100g
mr = 140g
Cp = ?

Cp = ms/mr * 100%
Cp = 40g/140g * 100% = 28,5%

b)
ms = 30g
mw = 100g
mr = 130g
Cp = ?

Cp = ms/mr * 100%
Cp = 30g/130g * 100% ≈ 23%
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2009-10-11T21:11:18+02:00
A)
masa subs. = 40g
masa rozp. = 100g
Cp = ?


masa roztworu = 40 + 100 = 140[g]
Cp = m_subs. / m_roztworu * 100%
Cp = 40g / 140g *100% = 28,57%

b)
ms = 28,5g
mrozp. = 100g


mr = 100 + 28,5 = 128,5[g]
Cp = 28,5 / 128,5 * 100% = 22,18%
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