Find the essence of the reaction between CO2 and H2O and how to react

The specific situation should be like this: CO2 and water reaction is the first to produce carbonic acid, carbonic acid ionization to form bicarbonate, the greater the concentration, the greater the degree of ionization, you should have heard it wrong, what your teacher said may refer to the reaction of CO2 with NaOH solution, a small amount of CO2 to generate carbonate, more is to generate more bicarbonate.

CO2+2C== (Condition: High Temperature) 2Co Synthesis Reaction [Carbon Monoxide is formed by carbon dioxide and carbon at high temperature].

CO2 + Ca(OH)2==CaCO3 + H2O Others [carbon dioxide reacts with clarified lime water to form calcium carbonate and water].

CO2+H2O==H2CO3 chemical reaction [carbon dioxide and water to form carbonic acid].

H2CO3 ==CO2+H2O decomposition reaction [carbonic acid decomposition into carbon dioxide and water].

CaCO3+2HCI==CaCl2+H2O+CO2 rising gas symbol [Limestone reacts with dilute hydrochloric acid to form water, calcium chloride and carbon dioxide] Negative decomposition reaction.

C+O2== (Condition: Ignition) CO2 [Carbon and oxygen form carbon dioxide under ignition conditions].

Carbon dioxide has the properties of being soluble in water, denser than air, non-combustible and non-combustible.

Dry ice is solid carbon dioxide.

Collecting CO2 can only be done by drainage.

Carbon dioxide can make clarified lime water turbid.

Carbon dioxide and carbonic acid produced by water can turn purple litmus paper red.

Too much carbon dioxide will lead to the greenhouse effect, and more new energy should be used to reduce emissions of coal, charcoal, natural gas, etc.

The above are all the test points about CO2 in the high school entrance examination.

Carbonic acid and carbon dioxide add water to react to form sodium bicarbonate, which involves the problem of monoacids and diacids.

2h2o2 ==2h2o + o2↑

CO2 + H2O ==H2CO3, Raw Match Grip into Late Selling Yard Row Carbonic Acid Unstable, H2CO3 ==H2O + CO2

Summary. The total reaction of CO2 + 3H2 = CH4 + 2H2O and 2H2O = 2H2 + O2 is CO2 + 3H2 = CH4 + 2H2 + O2

Total reaction of CO2 + 3H2 = CH4 + 2H2O and 2H2O = 2H2 + O2.

What is the total reaction of CO2 + 3H2 = CH4 + 2H2O and 2H2O = 2H2 + O2.

I've paid for it, can you hurry up.

Ok, thank you.

Now it's time to write a complete general equation. According to the method of processing mathematical equations, the second formula can be deformed into the first formula.

What is the procedure for ion concentration comparison?

Excuse me. Is the teacher there?

1. Known colored ions: the darker the color, the greater the ion concentration. For hydrogen (or hydroxide) ions, they can be judged by pH test strips.

2. Known colorless ions: a. Take a few drops in the test tube and add the exclusive chromogenic agent, the darker the color, the greater the concentration. b. Take a few drops in the test tube, add the exclusive precipitant, the more the precipitation, the greater the concentration.

3. Chemical analysis to determine the ion concentration, according to the results to determine the fiber breakage. This method is reliable, but the code lifting operation is cumbersome.

CO2 first reacts with H2O to give H2CO3

co2+h2o=h2co3

Then laugh at the reaction of ALO2- with acid to obtain a precipitate (analogous to hydrochloric acid reacting with ALO2-) ALO2- +H2CO3 + H2O = AL(OH)3 + HCO3-

Then the two letters are added together to get it.

AlO2- +CO2+2H2O = Al(OH)3 + HCO3- Ask again: How is HCO3- generated, please ask again: H2CO3 provides 1 H to ALO2-, and HCO3- remains.

It can also be considered that an excess of CO2, even if CO32- is produced, becomes HCO3- CO32- +CO2 + H2O = 2 HCO3-

Categories: Education Science >> Admission >> College Entrance Examination Problem Description:

A metal aluminum can is filled with CO2 gas, and then the tank is filled with a sufficient amount of NaOH solution, and the mouth of the can is immediately sealed, and after a period of time, the wall of the can is concave and deflated, and after a period of time, it is bulging again. Try a chemical equation to explain the above changes.

causes of pot deflated; As NaOH reacts with CO2.

2NaOH + CO2 = Na2CO3 + H2O So the gas in the tank gradually decreases.

The reason why the canister bulges again: NaOH reacts with AL.

2al+2naoh+2h2o=2naalo2+3h2, so the tank bulges again.

Does CO2 react with NaOH first, or does Al react with NaOH first, or do they react with NaOH together, but CO2 is faster?

Or what?

Analysis: Simultaneous reaction But the speed of the latter is slower, and the air knows al belongs to the amphoteric metal.

CO2 and NaOH reactions:

2NaOH + CO2 = Na2CO3 + H2O (NaOH excess), NaOH + CO2 = NaHCO3 (CO2 excess).

When the ratio of NaOH to CO2 is 2 to 1 or greater than 2 to 1, only Na2CO3 is present in the solution. When the ratio of NaOH to CO2 is between 1 to 1 to 2 to 1, there is Na2CO3 in the solution as well as NaHCO3. When the ratio of NaOH to CO2 is 1 to 1 or less than 1 to 1, only NaHCO3 is in the solution.

It should be noted that these two reactions cannot be added up directly, because the ratio of their two amounts is not necessarily 1:1, just like the first step generates 1mol of sodium carbonate, but the second step does not necessarily have 1 mol of carbon dioxide to consume all these sodium carbonates, so they cannot be added directly, and the ratio of the two reactions must be known.

2NaOH + CO2 = Na2CO3 + H2O (NaOH excess) NaOH + CO2 = NaHCO3 (CO2 excess) When the ratio of NaOH to CO2 is 2 to 1 or greater than 2 to 1, there is only Na2CO3 in the solution When the ratio of NaOH to CO2 is between 1 to 1 to 2 to 1, there is Na2CO3 in the solution and there is also NaHCO3

When the ratio of NaOH to CO2 is 1:1 or less than 1:1, only NaHCO3 in the solution is the process of breaking old chemical bonds and forming new chemical bonds. In the reaction, it is often accompanied by luminescence, heating, discoloration, and the formation of precipitates. The basis for determining whether a reaction is chemical is whether the reaction produces a new substance.

According to the theory of chemical bonds, it can be judged whether a chemical reaction is based on whether there is the breaking of old bonds and the formation of new bonds in a change process.

When there is enough carbon dioxide, it can react to form sodium bicarbonate

naoh+co2=nahco3

If it is insufficient, it depends on the amount of it, first of all, the reaction generates sodium carbonate 2NaOH + CO2 = Na2CO3 + H2O

Then the sodium carbonate reacts with the remaining carbon dioxide (of course, the carbon dioxide may have been consumed at this time, so there is no subsequent reflection).

Na2CO3 + CO2 + H2O = 2NaHCO3 Note that these two reactions cannot be added up directly, because the ratio of their two amounts is not necessarily 1:1, just like the first step to generate 1mol of sodium carbonate, but the second step does not necessarily have 1 mol of carbon dioxide to consume all these sodium carbonate, so it cannot be added directly, you have to know the ratio of the two reactions.

So, you're going to have a situation where "but when you combine them separately, you find the same" because you've assumed that CO2 can consume all of the sodium carbonate, but if that's the case, it's not called "insufficient".

The equation of CO2, H2O and Na2O2 reaction is tricky for many students, and it is basically written by rote memorization, but the good times are short-lived, and they will soon forget! So what to do? Teacher Qianlong created an original method to share with dear students, welcome students to be serious!

Sufficient amount: CO2 + NAOH = NAHC3

Deficiency: CO2 + 2NaOH = Na2CO3 + H2O

Your difference may be due to the fact that the water participates in the reaction, and the water can be counteracted by merging, because the water is just a transition in between.

2NaOH + CO2 = Na2CO3 + H2O (insufficient) NaOH + CO2 = NaHCO3 (excess).

In fact, the equation for excess comes from like this:

na2co3+h2o+co2=2nahco32naoh+co2=na2co3+h2o

2naoh+2co2=2nahco3

（1）（1）；A section of liquid column rises in the test tube; Carbon dioxide reacts with sodium hydroxide, causing less gas and less pressure in the tube, and the outside atmospheric pressure presses the liquid into the tube.

2) Carbon dioxide can be soluble in water, and it may be that carbon dioxide dissolves in water to reduce the air pressure in the test tube.

3) Take a little of the solution in the beaker in a test tube, add the barium chloride solution dropwise, if there is a white precipitate, it means that carbon dioxide and sodium hydroxide have reacted.