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a) FeCl
2
+ 2NaOH
→
Fe(OH)
2
+ 2NaCl (1)
Fe(OH)
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2
O (2)
Zo
b) n
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NaOH
=
fs
s2t
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=
(mol)
FeCl
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+ 2NaOH
Fe(OH)
2
+ 2NaCl
Theo ĐB: 1 mol 2 mol
Theo PT: 0.2mol 0.5 mol
Xét tỉ lệ:
s2f
Z
<
s2t
f
Vậy sau phản ứng NaOH d, FeCl
2
phản ứng hết
Theo PTPU (1) và (2) chất rắn sau khi nung là FeO
n FeO = n Fe(OH)
2
= n FeCl
2
= 0.2 mol
mFeO = 0.2. 72 = 14.4g
c, Các chất trong dung dịch lọc gồm NaCl, NaOH d
Theo PTPU (1)
n NaCl = n NaOH= 2n FeCl
2
= 2. 0.2= 0.4 mol
n NaOH d = 0.5 - 0.4 = 0.1 mol
m NaOH d = 0.1.40 = 4g
m NaCl = 0.4. 58.5 = 23.4g
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