Aqueous ferrous chloride (FeCl2) reacts with aqueous sodium hydroxide NaOH to produce ferrous hydroxideFe(OH)2 & sodium chloride (NaCl). Màu sắc changes, precipitating, balanced reaction, ionic equation of FeCl2 + NaOH reaction are discussed in this tutorial.

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## Aqueous ferrous chloride & aqueous sodium hydroxide reaction

Ferrous chloride ( Iron(II) chloride ) is asoluble inorganiccompound in water & form a pale green màu sắc solution.Sodium hydroxide is a strong alkaline colorless solution.

### What are the products when aqueous ferrous chloride reacts with aqueous sodium hydroxide

When we showroom aqueous NaOH solution khổng lồ aqueous FeCl2 solution,green color precipitate is formed. Thisprecipitate is ferrous hydroxide( Fe(OH)2 ).

### FeCl2 + NaOH = Fe(OH)2 + NaCl

Above reaction is not a balanced chemical reaction. Therefore, you need to balance this reaction & we will vì chưng itin next section.

## How khổng lồ balance FeCl2 & NaOH reaction?

This reaction is a not a redox reaction. Therefore by observing number of atoms in right side & left side, we can balance the reaction in few seconds.

### Balanced reaction of FeCl2 and NaOH

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

According to lớn the stoichiometry of the reaction, 1 mol of FeCl2 reacts with 2 mol of NaOH and produce 1 molof Fe(OH)2 và 2 mol of NaCl.

### Balanced reaction of FeCl2 và NaOH with physical states

FeCl2(aq) + 2NaOH(aq) = Fe(OH)2(s) + 2NaCl(aq)

Solubility of Fe(OH)2 is poor in water. Hence it deposits as a precipitate.

### What will happen if Fe(OH)2 is exposed to lớn air?

Fe(OH)2 is easily oxidized to lớn Fe(OH)3 by oxygen gas. Therefore, green màu sắc of the precipitate willbe changed lớn reddish brown when Fe(OH)3 is formed.

### If small voloume of low concentratrated NaOH is added to lớn FeCl2 solution, will it give a precipitate?

Whether NaOH concentration is low, if ferrous ion concentration is high, Fe(OH)2 precipitate will be formed due to having enough concentrations of ions khổng lồ exceed solubility product.

Write the ionic equation of forming Fe(OH)2, from NaOH và FeCl2

Fe2+ + OH- → Fe(OH)2

If FeCl2 + NaOH gives Fe(OH)2 pricipitate, will it dissove in excess NaOH?

Fe(OH)2 is not soluble in excess NaOH or aqueous ammonia solution.

What are the other ferrous +2 compound which can be used to lớn prepare Fe(OH)2 with NaOH?

If we can give Fe2+ ion lớn the NaOH solution, Fe(OH)2 precipitate can be formed. Lớn give Fe2+ ions, soluble Fe2+ compound should be used. Therefore, FeSO4, Fe(NO3)2 can be used as compounds. FeCO3 cannot be used because it is insoluble in water và gives very low Fe2+ ion concentration too.

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After few days of adding aqueous NaOH khổng lồ aqueous FeCl2, I saw a brown màu sắc precipitate. Why was happened to green màu sắc was at their beginning?

In the presence of oxygen gas, Fe2+ ions readily oxidizes to lớn Fe3+ ions. That"s why green color of Fe(OH)2 is tuned to lớn brown màu sắc of Fe(OH)3.

### How vì chưng I prepare Fe(OH)2 precipitate when ferrous, chlorine & aqueous sodium hydroxide are provided as raw materials?

This is not a single step work. You have to vì chưng some reactions.Solid ferrous metal reacts with chlorine gas khổng lồ produce solid ferric chloride.Add ferric chloride khổng lồ water. Then, again địa chỉ cửa hàng some ferrous to lớn that aqueous solution lớn react with ferric chloride. This will give ferrous chloride.Then, địa chỉ cửa hàng sodium hydroxide solution khổng lồ ferrous chloride solution.Related TutorialsFeCl3 + NaOH reactionReaction of cold và hot NaOH + Cl2Solubilityof metal hydroxides