Kolicinska koncentracija

amna0504's picture

Pet postotni rastvor H3PO4 ima gustocu 1,03 g/cm3 kolika je kol. konc. rastvora H3PO4?

milicaradenkovic's picture

V=1 l

mr=ro*V=1.030*1000=1030 g

w(H3PO4)=5 %

ms=mr*w(H3PO4)=1030*0.05=51.5 g

n(H3PO4)=ms/Mr=51.5/98=0.525 mol

c(H3PO4)=n(H3PO4)/V=0.525/1=0.525 mol/l