Treść zadania

jusia00

1. - Oblicz stęczenie procentowe roztworu otrzymanego przez dodanie 50 g wody do 200g syropu bedącego 25-procentowym roztworem cukru .
2. - Oblicz stę. proc. roztwo.soli kamiennej otrzymano przez dodanie 5 g tej substancji do 200g roztworu o stęzeniu 2,5 %.
3. - Obl. stę. proc. roztw. otrzymanego przez odparowanie 100 g wody z 500 g roztworu soli kamiennej o stezeniu 10 %

potrzebne na dziś .!! Autor edytował treść zadania 12.5.2010 (17:43), dodano Razem z Danymi i szukane . !!!!!

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    1. Cp = ms*100%/mr
    25% = ms*100%/200
    25%*200 = ms*100%
    ms1 = 50g

    ms2 = ms1 = 50g
    mr2 = 200g+50g = 250g

    Cp2 = 50*100%/250
    Cp2 = 20%

    2. 2,5% = ms*100%/200
    2,5%*200 = ms*100%
    ms1 = 5g

    ms2 = 5g+5g = 10g
    mr2 = 200g+5g = 205g
    Cp2 = 10*100%/205
    Cp2 = 4,88%

    3. 10% = ms*100%/500
    10%*500 = ms*100%
    ms = 50g

    mr2 = 500g-100g = 400g
    Cp2 = 50*100%/400
    Cp2 = 12,5%

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