Plemeniti metali

magdalena's picture

Masa od 15 g plavog kamena(CuSO4*5H2O),rastvorena je u 250cm3 vode.Izracunaj procenat CuSO4 u rastvoru.

Hvala.

milicaradenkovic's picture

15 g------------------------250 g/mol

x g----------------------------160 g/mol

x=15*160/250=9.6 g CuSO4

mr=m(vode)+ms

m(vode)=ro*V=250*1=250 g

mr=250+9.6=259.6 g

w(CuSO4)=ms/mr=9.6/259.6=0.037=3.7%