200 g 10% roztworu wodorotlenku potasu rozcieńczono, dolewając 100 g wody. Oblicz stężenie procentowe otrzymanego roztworu.
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Cp1=10%
Cp2=?
mr1=200g
mr2=?
mwody=100g
Cp=ms/mr*100%
ms=Cp*mr/100%
ms=10%*200g/100%
ms=20g
mr2=200g+100g=300g
Cp2=20g/300g*100%=6,7%
ms = 10% * 200 = 20
mr = 200 + 100 = 300
cp = ms/mr * 100% = 20/300 * 100% = 20/3 % = 6,7%