What is the chemical equation for the reaction of SO2 with NaOH?

SO2 is a weak reducing agent.

When dissolved in water, sulfite H2SO3 is formed.

Then the sulfurous acid reacts with NaOH to neutralize the acid and base.

Sulfite H2SO3 ionization step, first ionization of bisulfite HSO3- and H+ If there is not enough base, then it is only enough to neutralize the H+ ionized in this step, only this part of the first ionization of H+ is neutralized into water, and the remaining salt with sodium is bisulfite HSO3-, so the resulting product is NaHSO3 and water, remove the water that was previously combined with SO2, and the reaction formula is.

so2+naoh=nahso3

When there is enough alkali to consume all the H+ ionized in the first step, then the bisulfite Hso3- will be further ionized to form hydrogen ions and sulfite.

hso3-=h+

SO3(2-), the excess base will be neutralized in the second step ionized H+, so the salt with sodium becomes sulfite SO3(2-), and Na2SO3 is generated, and the reaction formula is.

2naoh+so2=na2so3+h2o

2naoh+so2=na2so3

H2O if the amount of SO2 is large.

That's to add this reaction.

na2so3

so2+h2o=2nahso3

High school, if SO2

There is a lot of volume, and these two reaction equations are still written together, but you also have to look at the teacher's requirements, after all, there are changes every year.

so2+2naoh==na2so3+h2o

Sulfur dioxide and sodium hydroxide react to form sodium sulfite and water.

SO2 reacts with NaOH. It can be used as a reference to the reaction of carbon dioxide with NaOH.

When the amount of SO2 is large, NaHSO3 is generated

If the amount of NaOH is large, Na2SO3 is generated

When sulfur dioxide is in small amounts, the chemical equation of the reaction is:

so2 + 2naoh = na2so3 + h2o；

When there is an excess of sulfur dioxide, the chemical equation of the reaction is:

so2+naoh=nahso3。

Analysis: The chemical equation for the reaction of sulfur dioxide and sodium hydroxide, depending on the amount of sulfur dioxide.

Sulfur dioxide applications:1. It is used as an organic solvent and refrigerant, and is used to refine various lubricating oils.

2. It is mainly used for the production of sulfur trioxide, sulfuric acid, sulfite, thiosulfate, and is also used as fumigant, preservative, disinfectant, reducing agent, etc.

3. Sulfur dioxide is a reductive bleach agent allowed to be used in China. It has a strong inhibitory effect on the bleaching of food and oxidase in plant food. China stipulates that it can be used for wine and fruit wine, and the maximum amount of use and residue shall not be exceeded.

4. Pesticides, man-made fibers, dyes and other industrial sectors.

5. It is used in the production of sulfur and as an insecticide and fungicide.

Sulfur dioxide reacts with sodium hydroxide, and the teacher operates step by step, and it is very simple to keep up with the operation.

The square defeat stroke: 2NaOH + SO2 = Na2SO3 + H2O sodium hydroxide solution reacts with a small amount and a small amount of sulfur dioxide respectively.

A small amount of 2NaOH+SO2=Na2SO3+H2OExcess 2NaOH+SO2=Na2SO3+H2O Na2SO3+H2O+SO2=2NaHSO3

so2 + h2o2 = h2so4

Sulfur dioxide reacts with water to form sulfuric acid.

so2+h2o==h2so3

H2SO3 is easily oxidized by oxygen: 2H2SO3 + O2==2H2SO4

This is one of the reasons for the formation of acid rain.