Nitrogen dioxide (NO2) is an acidic gas và readily reacts with water(H2O) to lớn produce an acidic solution ofnitric acid(HNO3) & nitrogen monoxide (NO). Brown màu sắc of nitrogen dioxide gas is disappearedwhen reaction occurs.

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Nitrogen dioxide gas reacts with water khổng lồ produce nitric acid and nitrogen monoxide.

This reaction happens very easily in water. Therefore, produced nitrogen dioxide gas is sent to lớn water to lớn manufacture nitric acid in chemical industry. This reaction is a redox reaction.

NO2 + H2O → HNO3 + NO

Sometimes, we write the chemical equation of nitrogen dioxide & water as below.

2NO2 + H2O → HNO3 + HNO2

In this reaction (consider as reaction 1), we see nitric acidand nitrous acid are formed as products.

Why there are two equations khổng lồ express products of nitrogen dioxide and water reaction?We can explain it lượt thích this.Nitrous acid is anunstable acid và readily decomposes to lớn nitric acid, water & nitric oxide.HNO2 → HNO3 + NO + H2O

When we balance this equation (consider as reaction 2),3HNO2 → HNO3 + 2NO + H2OBy combining reaction 1 & reaction 2 khổng lồ remove nitrous acid from major equation, we will get our proper equation.( 3 * reaction 1 + reaction 2 )6NO2 + 3H2O + 3HNO2 → 3HNO3 + 3HNO2 + HNO3 + 2NO + H2O6NO2 + 2H2O + → 4HNO3 + 2NO3NO2 + H2O + → 2HNO3 + NONO2 is a brown color gas. It"s brown màu sắc is disappeared when NO2 reacts with water.This reaction is industrially used for nitric acid production from ostwald method.Also, this is the reaction which causes acid rains from nitrogen dioxide gas in the atmosphere.This reaction is a disproportionation reaction because nitrogen on nitrogen dioxide molecule is reduced andoxidized. This is discussed in detail later on this tutorial.Due khổng lồ reaction with water, nitrogen dioxide dissolve very well in water.

Balanced chemical equation with physical states

Gaseous nitrogen dioxide reacts with liquid water và produce nitric acid which is highly soluble in water(therefore, nitric acid exists as an aqueous solution) và gaseousnitrogen monoxide.

3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g)

NO2 + H2O is a disproportionation reaction

Oxidation number of nitrogen at NO2 is +4 according lớn thelewis structure of NO2.When reaction occurs, NO2 is oxidized khổng lồ nitric acid. In nitric acid, oxidation number of nitrogen is +5.Simultaneously lớn the oxidation, another NO2 molecules are reduced to NO. The oxidation number ofnitrogen in NO is +2. Therefore, nitrogen atom in NO2 is reduced and oxidized simultaneously và those reactionsare defined as disproportionation reactions.

Uses of nitrogen dioxide and water reaction

This reaction is used in nitric acidproduction; ostwald process. Produced nitrogen dioxide gas is sent lớn water lớn producenitric acid. As a by product, nitric oxide (NO) is produced. It is also used to lớn produce nitric acid by separating andconverting khổng lồ nitrogen dioxide in the manufacturing process.

Nitrogen dioxide and water balanced equation

3NO2(g) + H2O(l) → 2HNO3(aq) + NO(g)Questions asked by studentsAsk your question & find theanswer free.

Oxidation number of nitrogen in nitrogen dioxide is +4. Also oxidation number of nitrogen in dinitrogen trioxide is four. Will both nitrogen dioxide & dinitrogen trioxide will react with water in same way?

As nitrogen dioxide, dinitrogen trioxide reacts with water and form nitric acid & nitric oxide. Therfeore oxidation number of nitrogen is changed when both nirogen dioxide and dinitrogen trioxide react with water.

What is the pH value when nitrogen dioxide dissolve in water? (when nitrogen dioxide reacts with water)

pH value will be lover than seven because of nitric acid formation. If lot of nitrogen dioxide is dissolves, pH valuewill be a value lượt thích 1,2 forming a strong acidic solution (Nitric acid is a strong acid).

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How vày I use NO2 + H2O reaction to kiểm tra NO2 gas and Br2 gas?

Both bromine & nitrogen dioxide gases are brown color gases. Therefore we cannot identify them, by observing their colors.In this tutorial, we have learned that NO2 will readily reacts with water & lost it"s brown màu sắc during thereaction. But, bromine gas which is a brown màu sắc too, does not dissolve lượt thích NO2. So brown màu sắc ofBr2 remains in the water.

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