Do 28g 7,5 % r-ru KCl dodano 122g wody. Oblicz C%.
Prosze o pomoc
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Do 28g 7,5 % r-ru KCl dodano 122g wody. Oblicz C%.
Prosze o pomoc
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ms - masa substancji
mr - masa roztworu
Cp - steżenie procentowe
mw - masa wody
Cp=ms/mr *100%
mr₁=28g
Cp₁ =7,5%
ms=Cp₁/100% *mr₁
ms =7,5%/100% * 28g =
= 2,1g
po dodaniu wody:
mr₂=mr₁+mw
mr₂=28g+122g=150g
Cp₂=ms/mr₂ *100%
Cp₂=2,1g/150g *100% =
= 1,4%