Rastvorljivost

Submitted by Joca994 on Thu, 01/30/2014 - 17:17
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Koliko molova K2S treba rastvoriti u 100g H2O da bi se dobio 5% rastvor?

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milicaradenkovic - Thu, 01/30/2014 - 17:51

mr=ms+m(vode)

w(K2S)=ms/mr=ms/(ms+m(vode))

0.05=ms/(ms+100)

0.05*ms+5=ms

5=0.95*ms

ms=5/0.95=5.26 g

n(K2S)=ms/Mr=5.26/110=0.0478 mol