Chlorine (Cl ) Sodium Hydroxide (Naoh) 2

Sodium hydroxide reacts with chlorine gas in different ways according khổng lồ the concentration and temperature of the solution và it gives different products. NaOH and Cl2 reaction is an oxidation - reduction reaction và those reactions are more special because they are disproportionation reactions.

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Ways of reactions of NaOH + Cl2

There are two reactions can be happened according to the concentration and temperature of the sodium hydroxide solution.

Cold dilute NaOH and Cl2 reaction Hot concentrated NaOH & Cl2 reaction

Sodium hydroxide and chlorine gas reaction is completely different from sodium & chlorine gas reaction.

Cold Dilute NaOH and Cl2 reaction | NaOH + Cl2 = NaCl + NaOCl + H2O

Cold dilute sodium hydroxide và chlorine gas reaction is disproportionation.Chlorine gas is oxidized & reduced to OCl- ion and Cl- ion respectively. As products sodium chloride, sodium chlorate(i) and water are given.

Hypochlorite ion | chlorate ion(i) - OCl- Sodium chloride - NaCl Sodium chlorate(i) - NaOCl

Aqueous NaCl, NaOCl solution is called as the Milton solution. Hypochlorite ion exists in bleaching powder.

Chemical Balanced Equation


In hypochlorite ion, chlorine atom is in the +1 oxidation state. In NaCl, chlorine is at -1 oxidation state.

Hot concentrated NaOH và Cl2 reaction | NaOH + Cl2 = NaCl + NaClO3 + H2O

Hot dilute sodium hydroxide and chlorine gas reaction is also a disproportionation reaction.Chlorine gas is oxidized and reduced to ClO3- ion & Cl- ion respectively. As products sodium chloride, sodium chlorate(iii) và water are given.

Chlorite ion - ClO3- Sodium chlorate(iii) - NaClO3

Chemical Balanced Equation


In chlorite ion, chlorine atom is in the +5 oxidation state.

Hypochlorite | Chlorate(i) ion | OCl-

OCl- ion is an unstable ion it exists only in cold states. When temperature increases, it disproportionate khổng lồ chloride ion and chlorate ion. Negative sầu charge is on the oxyren atom.


As chlorine gas, other halogens except fluorine also react with sodium hydroxide và give sầu similar products as NaOH + Cl2 reaction.

Balancing the cold dilute NaOH và Cl2 reaction

We know this reaction is a disproportionation reaction. When we see the products, it's clear that Cl2 is oxidized khổng lồ OCl- & reduced to lớn Cl-. Oxidation numbers of cglorine in OCl- ion is +1 & Cl- ion is -1.

Now check the differences of each oxidation numbers in oxidation và reduction. It is one in both. Then exchange the differences.

Then balance other elements. Chechồng Na atoms in both sides. There are two Na in the right side. So we put two in front of NaOH. Then kiểm tra hydrogene balance. Left side has two hydrogene atoms so far now. Then only one H2O molecule in the right side is enough khổng lồ balance the hydrogene equation.


This type of redox reaction balancing example is reaction of chlorine gas with ammonia.

What is a disproportionation reaction?

A reaction in which a substance is simultaneously oxidized & reduced, giving two different products.

Examples NaOH + Cl2 reaction Hydrogen peroxide decomposition lớn water và O2


Now we need lớn produce NaOCl and NaClO3. So we need NaOH and Cl2 gas.

Electrolysis of Brine (NaCl)

Electrolysis of brine solution will produce NaOH, Cl2 gas & H2 gas as products.


We can collect Cl2 gas can cool the gas before sover it lớn the produced NaOH to occur the reaction. NaOH solution also should be cold.


Produced Cl2 is sent to the hot NaOH.

In both occasions, NaCl is produced as a sản phẩm. We can separate it by a separton method from NaOCl or NaClO3.

Mechanism of Cl2 + dilute cold NaOH reaction

When chlorine gas dissolve sầu in water, it produce hypochlorous acid (HOCl) and hydrochloric acid (HCl). You know acids react with bases & produce a salt và water as products. So when NaOH is in the presence of HOCl and HCl solution, following reactions are occurred.

HOCl và NaOH react & produce NaOCl & water. HCl và NaOH react and produce NaCl & water as products.

Safety of NaOH + Cl2 reaction

This safery và harmful facts are both valid for reaction of Cl2 with hot NaOH và cold NaOH.

NaOH is corrosive and may severely irritate skin, eyes, & mucous membranes. Also corrosive sầu to lớn the metals. Cl2 is a yellow - green toxic
gas. When you dealing with Cl2, be very careful to get protected from it.


Ask your question now

As chlorine gas, will bromine & iodine react with sodium hydroxide?

We know bromine and iodine are less soluble than chlorine in water. Therefore, bromine and iodine bởi vì not react with sodium hydroxide as chlorine gas. That means, their (bromine and iodine) reaction rates are much slower than chlorine gas.

equation for the reaction between chlorine và hot concentrated alkali

We can denote the alkali as MOH in the equation. Chlorine (Cl2) is oxidized to lớn chlorate (ClO3-) ion và chloride ion (Cl-) when it reacts with hot concentrated alkali.

3Cl2 + 6MOH → 5MCl + MClO3 + 3H2O

What will happen, when Cl2 gas is sent to lớn the water?

Cl2 hydrolysis in the water. HCl và HOCl are given as products. HCl is a svào acid & HOCl is a weak acid. HOCl is a very good disinfectant & more efficient than bleaching powder.

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Can I use this chlorine & NaOH reaction lớn neutralize Cl2 gas?

Yes. You can use NaOH and this is very efficient way to bởi vì the neutralization. But you have khổng lồ consider about the cost of this neutralization method because NaOH is so expensive.

What is chlorinated water or chlorination of water?

The process of adding chlorine or chlorine compounds such as sodium hypochlorite (NaOCl) lớn water. This is done in swimming pools. This is done to lớn kill certain bacteria và other microbes in tap water as chlorine is toxic to those microbes. That's why we feel smell of chlorine gas in the swimming pools.

Chlorine reacts with hot and concentrated NaOH, But why products are different?

When temperature is high, the ability to oxidation is high. Therefore produced NaOCl is oxidized khổng lồ NaClO3 from +1 to +5 (oxidation umber of chlorine).

How this reaction is different from sodium hydroxide and HCl reaction?

NaOH & HCl reacts as base and acid respectively and produce salternative text (NaCl) & water as products. That reaction is not a redox reaction.

disproportionation reaction of water with sodium hydroxide

There is no disproportionation reaction oof water & sodium hydroxide. Only sodium hydroxide dissolve sầu very well in water và dissociate khổng lồ sodium ion và hydroxyl ions completely.

ocl- ion oxidation state?

We know electronegativity of oxygene is higher than chlorine. So negative sầu charge should be on oxygene atom whole chlorine atom is oxidized due to higher electronegativity of oxygene. There is a single bond between oxyren & chlorine. Therefore oxidation number of chlorine is +1.

What will be the pH value after cold dilute NaOH reacts with chlorine gas if reactants are completely finished?

We know NaOH is a svào base. So it shows higher pH value which is greater than 7 at 250C.

How pH is calculated for a svào base?

When all NaOH reacts with all chlorine, there is no remaining NaOH & Cl2. Produced NaCl và NaOCl are in the solution and we should consider, whether their ability lớn hydrolysis of water khổng lồ make water acidic or basic.

how does sodium hydroxide neutralize chlorine?

Use aqueous sodium hydroxide solution to neutralize chlorine gas. But commonly, spraying a solution of baking sodomain authority in water into lớn the air or urea solution will be used. Cost of NaOH is very high.

Equipment to react chlorine with caustic soda?

Chlorine gas reacts with iron & produce ferric chloride. So we cannot use iron as the reactant container equipment.

Also, caustic sodomain authority slowly reacts with glass and form sodium silicate. So glass container is also not suitable for the reaction equipment.

Stability of NaCl

Sodium ion and chloride ion are stable in the water & vì not involve sầu in hydrolysis of water. So NaCl is a neutral salternative text.

Stability of NaOCl in water

Hypochlorite ion is not stable in water and involve in hydrolysis of water lớn prouce HOCl và OH- ion. So aqueous solution will basic due to release of hydroxyl ion.

Due khổng lồ formation of OH- ions, aqueous solution gets basic và show pH values of greate than 7. But not much as aqueous NaOH solution.

Can I vì chưng NaOH, Cl2 reaction in the laboratory?

Yes. You can. You can prepare cold NaOH solution by using ice crystals or cold water. But, you will be find difficult khổng lồ find chlorine gas in the laboratory. Then, you can try to lớn make chlorine gas yourself. Mix dilute HCl solution and potassium permanganate solution. That will give Cl2 gas. Feed produced Cl2 gas safely through tubes to the NaOH solution.

reaction of chlorine with sodium hydroxide acid or base?

Reaction of chlorine with sodium hydroxide can be considered as an acid-base reaction. How vì I say that?

First, chlorine dissolve sầu in water và produce hydrochloric acid (HCl) & hypochlorous acid (HOCl). These two acids react with NaOH separately to give NaCl và NaOCl respectively.

sodium hydroxide react with chlorine lớn khung bleaching powder, equation for reaction

Sodium hydroxide is not used in the production of bleaching powder. Ca(OH)2 reacts with chlorine lớn produce bleaching powder.

Reaction of caustic và chlorine

Caustic sodomain authority is a another name for NaOH. So reactions are same as NaOH and Cl2.

caution pool chorine naoh?

You may feel, smell of chlorine gas on swimming pools. This happens due to lớn formation of chlorine gas from NaOCl which is added as a disinfectant.

chlorine gas & hydroxide

In the presence of hydroxyl ions (OH-) ions, chlorine gas is reduced khổng lồ Cl- and oxidized to OCl- or ClO3- ion. The oxidation sản phẩm depends on the concentration and temperature of the hydroxide solution. If temperature is high, chorine gas is oxidized to a its +5 oxidation state compound ClO3-.

Write a chemical equation for reaction between chlorine gas và dilute sodium hydroxide

NaOH + Cl2 → NaCl + NaClO + H2O

sodium & oxygene gas reaction?

If sodium piece is kept in the atmosphere, sodium readily reacts with oxyren & produce sodium oxide (Na2O). But, in the presence of oxygene gas stream, sodium gives sodium peroxide as the sản phẩm. Sodium peroxide và sodium oxide both reacts with water to produce NaOH.

Which gas is produced when NaOH is prepared?

Chlorine & hydrogen gases are formed when concentrated aqueous NaCl is electrolyzed lớn produce NaOH. To prsự kiện the reaction of chlorine và NaOH, a membrane is placed between cathode và anode.

sodium and chlorine reaction equation

2Na + Cl2 → 2NaCl

Chlorine & NaOH reaction have been included in following syllabuses. Cambridge International AS và A Level Chemistry General Certificate of Education (Advanced Level) GRADES 12-13

Related Tutorials to NaOH và Cl2

Chloride ion testing Alkali earth metal chemistry Alkali metals chemistry Amphoteric Compounds Reacts with NaOH Identify cations by precipitating Precipitates compounds colours Oxidation Numbers of Elements in Periodic Table FeCl2 + NaOH reaction Solubility of metal hydroxides
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