What happens when Na2O2 and FeCl2 react

A redox reaction occurs to oxidize ferric iron to ferric iron.

At the same time, because hydroxide is generated, iron hydroxide precipitation is obtained.

Redox reactions.

If the reaction is in water, it can be divided into several reactions, and it should be considered separately.

Sodium peroxide first reacts with water to form hydrogen peroxide and sodium hydroxide, hydrogen peroxide reacts with ferrous chloride to form iron chloride and water, and ferric chloride reacts with iron hydroxide to form iron hydroxide.

This reaction must be carried out in solution: the specific reaction is as follows:

2Na2O2+2H2O=2NaOH+O2 2NaOH+FeCl2===Fe(OH)2 +2NaCl4Fe(OH)2+2H2O+O2===4Fe(OH)3 The total equation is: 8Na2O2+4FeCl2+4H2O===8NaCl+4Fe(OH)3 +3O2

Sodium chloride and ferric hydroxide precipitation.

In the reaction in solution, water must be present

6na2o2+12fecl2+12h2o=12nacl+8fe(oh)3+4fecl3

The equation of CO2, H2O and Na2O2 reaction is tricky for many students, and it is basically written by rote memorization, but the good times are short-lived, and they will soon forget! So what to do? Teacher Qianlong created an original method to share with dear students, welcome students to be serious!

2na2o2+2h2o=4naoh+o2 (don't forget the arrows).

2NaOH + FeCl2 = Fe(OH)2 (precipitation symbol) + 2NaCl

4fe(oh)2+o2+2h2o=4fe(oh)3

This reaction has the participation of water.

4na2o2+6h2o+4fecl2=8nacl+4fe(oh)3↓+o2↑

Ferric chloride and sodium hydroxide are generated.

Hello, the reaction principle of this is that sodium peroxide and water are reacted to obtain sodium hydroxide and oxygen, 2A2O2+2H2O==4NaOH+O2 Sodium hydroxide and ferrous ions are reacted to obtain the precipitate Fe2++2OH-==Fe(OH)2

Ferrous hydroxide is very easy to be oxidized, so it reacts with the oxygen generated before again, and obtains iron hydroxide 4Fe(OH)2+2H2O+O2==4Fe(OH)3 The total coefficient of these reactions can be adjusted when matching, because there are 4molFe(OH)2, so with 4, then 8molOh-, so with 2, there is 2mol of oxygen obtained, but 1mol is consumed, so 1mol is left

So after trimming, it is.

4nao2+6h2o+4fecl2==4fe(oh)3↓+8nacl+o2↑

Hope it helps!

If you don't understand, please ask!

The first floor is misguided...

The reaction starts with: 2Na2O2 + 2H2O == 4Na+ +4OH- +O2

Step 2: 4Fe2+ +O2 + 2H2O + 8OH- == 4Fe(OH)3

The reaction is unlikely to produce Fe3+ in any case. Because FeCl2 solution pH5 6, the addition of Na2O2 makes the solution pH develop towards alkaline, while Fe3+ precipitation occurs from time to time.

ph = 14 + 1/3

If pH = 5, lgksp[Fe(OH)3] = -pksp[Fe(OH)3] = solution.

C(Fe3+)=, i.e., Fe3+ precipitates rapidly once it is generated.

Total equation: 4Na2O2 + 4FeCl2 + 6H2O == 4Fe(OH)3 + 8NaCl + O2

This total reaction equation depends on the amount of Na2O2, sodium peroxide is strongly oxidizing and can oxidize divalent iron to ferric iron, and at the same time sodium hydroxide is produced, which can partially precipitate the produced ferric ions (at this time the sodium hydroxide produced is insufficient. If the sodium peroxide added is excessive (the above reaction occurs, all FeCl2 is oxidized), then 2Na2O2+2H2O=4NaOH+O2 will occur, and the sodium hydroxide produced can also precipitate ferric ions. That is, if sodium hydroxide is excessive, it can completely precipitate iron ions.

Fe2+ is reductive and can be reduced to Fe3+;

clo- is oxidizing, and chloride ions will oxidize from +1 valence to -1 valence;

6FeCl2+3NaCl+3H2O==2Fe(OH)3 +4FeCl3+3NaCl (NaClo a small amount).

2FeCl2+5NaClO+5H2O==2Fe(OH)3 +4HCO+5NaCl (NaClo excess).

Ferric ions are reducible and hypochlorite ions are oxidizing. Hypochlorite ferric ions are oxidized to ferric 3.

fe2+ +4clo- = fe3+ +4 cl- +2o2

6FeCl2+3NaCl+3H2O=2Fe(OH)3 +4FeCl3+3NaCl (NaClo has a small amount of limb bonds).

2FeCl2+5Naclo+5H2O=2Fe(OH)3 Stalls+4HCO+5NaCl (Naclo Hunger).

Problem solving ideas: According to the properties of the provided substances, analyze each option in turn, and select the substances that can react with all three substances in the problem and the collapsed circle stem

a. Water does not react with the above three substances, which is wrong;

b. Clarified lime water is alkali, which does not react with iron oxide in metal oxides, nor does it react with barium chloride.

c. Dilute sulfuric acid and metal oxides, soluble barium salts, and carbonates can react, which is correct;

d. Sodium sulfate does not react with iron oxide and sodium carbonate, so C2, C is selected for this error

A does not respond.

B and BACL2 do not react.

d and fe2o3, na2CO3 does not react, 2, hello:

Select C Fe2O3 + 3H2SO4==Fe2(SO4)3+3H2OBaCl2+H2SO4==BaSO4 +2HCLNa2CO3+H2SO4==Na2SO4+H2O+CO2 Finish, look at O( O,2, the following substances that can react with Fe2O3, BACL2, and Na2CO3 are ( ).

a.Water bClear lime water.

c.Dilute sulfuric acid.

d.Sodium sulfate solution.