SO2 laboratory method, SO2 laboratory method

Laboratory preparation of SO2.

1) Reaction principle: Na2SO3 + H2SO4 (concentrated) = Na2SO4 + H2O + SO2

2) Experimental device: Cl2 device (but no heating).

3) Precautions:

Since SO2 is easily soluble in water. Therefore, concentrated H2SO4 and Na2SO3(S) reactions should be used. The reaction is between the solid and the liquid, and the mechanical model is also trance, especially from the turbulent Qinchen school, and the slamming of the L2 device.

Usually Na2SO3(S) is in powder form. to control the rate of reaction. Concentrated H2SO4 should be dropped dropwise from the separating funnel.

Concentrated hydrochloric acid is not to be used. Because it contains a large amount of water (at room temperature and pressure. The largest concentrated hydrochloric acid with a mass fraction is 45% concentrated hydrochloric acid).Otherwise, a large amount of SO2 will be dissolved in the water.

Mol·L-1 concentrated H2SO4 (i.e., concentrated H2SO4 with a mass fraction of 98%) cannot be used. Because there is a lack of moisture in it. Sulfuric acid is not ionized.

It still exists in molecular form. The reaction between Na2SO3(S) and H2SO4 can only be carried out smoothly when H2SO4 is ionized into ions. Therefore, a concentrated H2SO4 with a volume ratio of 1 1 is usually used

Na2SO3 (AQ) should not be used. Because it contains a lot of water. The initial phase mainly generates HSOs

Resources.

1) Reaction principle: Na2SO3 + H2SO4 (concentrated) = Na2SO4 + H2O + SO2

2) Experimental device: Cl2 device (but no heating).

3) Precautions:

Because SO2 is easily soluble in water, the concentrated H2SO4 and Na2SO3 (S) reactions should be selected, and the reaction is between solid and liquid Mechanical model is also a trance from the Turbulence Chenchen Proofreading Lady Brake Piggyback Patient You Rong Gang L2 Device Usually Na2SO3 (S) is in powder form, in order to control the reaction rate, concentrated H2SO4 should be dripped drop by drop from the separating funnel

Concentrated hydrochloric acid cannot be used because it contains a large amount of water (45% concentrated hydrochloric acid with the largest mass fraction at room temperature and pressure), otherwise a large amount of SO2 will be dissolved in the water

The concentrated H2SO4 of mol·l 1 (i.e., the concentrated H2SO4 with a mass fraction of 98%) cannot be used, because of the lack of water, the sulfuric acid is not ionized, and still exists in molecular form, and the reaction between Na2SO3 (S) and H2SO4 can only be carried out smoothly in the state of ionization of H2SO4 into ions, so the concentrated H2SO4 with a volume ratio of 1 1 is usually used

Na2SO3 (AQ) is not suitable because it contains a lot of water, and it mainly generates HSO in the initial stage

1) Reaction principle: Na2SO3 + H2SO4 (concentrated) = Na2SO4 + H2O + SO2

2) Experimental device: Cl2 device (but no heating).

3) Precautions:

Because SO2 is easily soluble in water, the concentrated H2SO4 and Na2SO3 (S) reactions should be selected, and the reaction is between solid and liquid Mechanical model is also a trance from the Turbulence Chenchen Proofreading Lady Brake Piggyback Patient You Rong Gang L2 Device Usually Na2SO3 (S) is in powder form, in order to control the reaction rate, concentrated H2SO4 should be dripped drop by drop from the separating funnel

Concentrated hydrochloric acid cannot be used because it contains a large amount of water (45% concentrated hydrochloric acid with the largest mass fraction at room temperature and pressure), otherwise a large amount of SO2 will be dissolved in the water

The concentrated H2SO4 of mol·l 1 (i.e., the concentrated H2SO4 with a mass fraction of 98%) cannot be used, because of the lack of water, the sulfuric acid is not ionized, and still exists in molecular form, and the reaction between Na2SO3 (S) and H2SO4 can only be carried out smoothly in the state of ionization of H2SO4 into ions, so the concentrated H2SO4 with a volume ratio of 1 1 is usually used

Na2SO3 (AQ) is not suitable because it contains a lot of water, and it mainly generates HSO in the initial stage

1) Reaction principle: Na2SO3 + H2SO4 (concentrated) = Na2SO4 + H2O + SO2

2) Experimental device: Cl2 device (but no heating).

3) Precautions:

Because SO2 is easily soluble in water, the concentrated H2SO4 and Na2SO3 (S) reactions should be selected, and the reaction is between solid and liquid Mechanical model is also a trance from the Turbulence Chenchen Proofreading Lady Brake Piggyback Patient You Rong Gang L2 Device Usually Na2SO3 (S) is in powder form, in order to control the reaction rate, concentrated H2SO4 should be dripped drop by drop from the separating funnel

Concentrated hydrochloric acid cannot be used because it contains a large amount of water (45% concentrated hydrochloric acid with the largest mass fraction at room temperature and pressure), otherwise a large amount of SO2 will be dissolved in the water

The concentrated H2SO4 of mol·l 1 (i.e., the concentrated H2SO4 with a mass fraction of 98%) cannot be used, because of the lack of water, the sulfuric acid is not ionized, and still exists in molecular form, and the reaction between Na2SO3 (S) and H2SO4 can only be carried out smoothly in the state of ionization of H2SO4 into ions, so the concentrated H2SO4 with a volume ratio of 1 1 is usually used

Na2SO3 (AQ) is not suitable because it contains a lot of water, and it mainly generates HSO in the initial stage

The sulfur dioxide production method in the laboratory uses sodium sulfite to react with concentrated sulfuric acid to produce sulfur dioxide

na₂so₃+h₂so₄=na₂so₄+so₂(g)+h2o；

Or heat and react with copper and concentrated sulfuric acid to obtain sulfur dioxide:

Cu + H So (concentrated) = Heating = CuSo4 + So (g) + H O;

At the end of the experiment, sodium hydroxide solution 2NaOH+SO=NaSO+HO.

Note that because SO is easily soluble in water, the concentrated H So and Na SO(S) reactions should be used, the reaction is between solid and liquid, and Na SO(S) is in powder form, and in order to control the reaction rate, the concentrated H So should be drip down from the separating funnel drop by drop.

Concentrated hydrochloric acid cannot be used, because it contains a large amount of water (at room temperature and pressure, the largest concentrated hydrochloric acid with the largest mass fraction is 45% concentrated hydrochloric acid), otherwise there will be a large amount of SO (dissolved in water

The concentrated H SO (i.e., the concentrated H SO with a mass fraction of 98%) can also not be used, because there is a lack of water, the sulfuric acid is not ionized, and it still exists in molecular form, and the reaction between Na SO (S) and H SO can be carried out smoothly in the state of ionization of H SO, so the concentrated H SO with a volume ratio of 1 1 is usually used

The method of making sulfur dioxide in the laboratory is as follows:

The sulfur dioxide production method in the laboratory uses sodium sulfite to react with concentrated sulfuric acid to produce sulfur dioxide, or uses copper to heat and react with concentrated sulfuric acid to obtain sulfur dioxide.

At the end of the experiment, sodium hydroxide solution 2NaOH+SO=NaSO+HO.

Note that because so is easily soluble in water, the concentrated H so and Na SO(S) reactions should be selected, the reaction is between solid and liquid, and Na SO(S) is in powder form, in order to control the reaction rate, the concentrated H so should be dropped drop by drop from the separating funnel.

Concentrated hydrochloric acid cannot be used, because it contains a large amount of water (at room temperature and pressure, the largest concentrated hydrochloric acid with the largest mass fraction is 45% concentrated hydrochloric acid), otherwise there will be a large amount of SO (dissolved in water

Concentrated H SOs (i.e., concentrated H SOs with a mass fraction of 98%) are also not used, because there is a lack of moisture in them, and the sulfuric acid is not ionized and still exists in molecular form.

However, the reaction between Na SO(S) and H So can only be carried out smoothly when H So is ionized into ions, so a concentrated H SO with a volume ratio of 1 1 is usually used