Question

Do 120g 40% roztwory wodorotlenku sodu dodano 200g wody. Oblicz stezenie otrzymanego roztworu?

Answer 1

Mr=120g
cp=40%
mw=200g
cp1=?
--------------------------------------------------
cp=ms*100%/mr
ms=cp*mr/100%=40%*120g/100%=48g
mr1=mr+mw=120g+200g=320g
cp1=ms*100%/mr1=48g*100%/320g=15%