Question

Se trateaza 120g solutie de hidroxid de potasiu de concentratie 25% cu o solutie de sulfat de aluminiu.Ce cantitate de sulfat de aluminiu s-a consumat?

Answer 1

-CALCULEZ masa de KOH din solutia data
c/100=md/ms
25/100= md/120----> md= 30g KOH
- ECUATIA REACTIEI ESTE

6KOH+AL2(SO4)3----.> 3K2so4 + 2Al(OH)3
6x56g.......342g
30g.....................x=.......calculeaza !!!!

M,KOH=(39gK+16gO+1gH)/mol= 56g/mol
M,Al2(SO4)3=(2x27gAl+3x32gS+12x16gO)/mol=342g/mol