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

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%