calc. md FeCl3 din solutia data:
c/100=md/ms; 8,125/100= md/400---.>md= 32,5gFeCl3
1mol 3mol
FeCl3 + 3NaOH---> 3NaCl +Fe(OH)3
162,5g..........3x40g
32,5.................X
Cu x=md NaOH afli ms sol NaOH din relatia:
4/100= X/ms----------------------> ms=
