FeCl3 + 3NaOH -> Fe(OH)3 + 3NaCl
0,2.............................0,2 (mol)
CuCl2 + 2NaOH -> Cu(OH)2 + 2NaCl
0,16.............................0,16 (mol)
mkết tủa = 0,2.107 + 0,16.98=37,08 (g)
Bài 2
nK2O = 0,15 (mol) , nNa2O = 0,075 (mol)
=> nKOH = 0,3 (mol) , nNaOH = 0,15 (mol)
CM(KOH) = 0,3/0,5=0,6 (M)
CM(NaOH) = 0,15/0,5=0,3(M)
Bài 1:
nFeCl3 = 0.2 mol
nCuCl2 = 0.16 mol
FeCl3 + 3NaOH --> Fe(OH)3 + 3NaCl
0.2________________0.2
CuCl2 + 2NaOH --> Cu(OH)2 + 2NaCl
0.16________________0.16
mKt = mFe(OH)3 + mCu(OH)2 = 0.2*107+0.16*98 = 37.08 g
Bài 2 :
nK2O = 0.15 mol
nNa2O = 0.075 mol
K2O + H2O --> 2KOH
0.15___________0.3
Na2O + H2O --> 2NaOH
0.075___________0.15
CM KOH = 0.3/0.5 = 0.6M
CM NaOH = 0.15/0.5 = 0.3M