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1. mr=40g
Cp=2%
d=0,79 g/cm3
2. Cp=6%
1. Cp=ms/mr * 100%
2=ms/40 * 100
ms=40*2/100
ms=0,8g
2. Cp= [(ms+x)/(mr+x)] *100%
6=[(0,8 + x)/(40+x)] *100
6/100 = (0,8 + x)/(40+x)
[6(40+x)]/100 = 0,8+x
240+6x = (0,8+x)*100
240+6x = 80 + 100x
160=94x
x=1,7
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Oblicz ile substancji trzeba dodać do 35g roztworu 10-procentowego aby otrzymać roztwór o stężeniu 50%
1. mr=35g
Cp=10%
2. Cp=50%
1. 10=ms/35 * 100
0,1*35=ms
ms=3,5g
2. 50= [(3,5+x)/(35+x)]*100
0,5(35+x) = 3,5+x
17,5 +½x = 3,5+x
14=½x
x=28g