Question

URGENT VA ROG!!cu ce cantitate de potasiu OH reactioneaza 50 g sol Fe Cl3 de c=25℅ ? ce masa de precipitat se form.

Answer 1

c=(md/ms)*100=>md=(c*ms)/100 md FeCl3=(25*50)/100=12.5 Apoi scrii reactia: 3KOH+FeCl3---> 3KCl+Fe(OH)3 M K OH=39+16+1=56 M FeCl3=56+3*36.5=162.5 x g KOH=(3*56*12 5)/162.5=2100/162.5=12.92 g KOH Precipitatul este FeCl3 si il aflii asemanator din reactie.