How Na2CO3 produces NaHCO3

co2+h2o+na2co3===2nahco3

The product on the right produces precipitate, gas, and water, and this reaction can all occur.

To be precise, this reaction can occur as long as a precipitate, gas, water, or weak electrolyte can be generated.

co2+h2o+na2co3===2nahco3

This equation is true, according to the content of the high school elective, as long as precipitate, gas, water or weak electrolytes can be generated, this reaction can occur, and NaHCO3 is a weak electrolyte.

Cuco3 is unstable because it dissolves in water as soon as it generates a precipitate (which I remember seems to be), and this equation should hold, according to my memory.

Weak electrolytes are simply electrolytes that cannot be completely ionized in a molten or aqueous state.

If you are a junior high school student, I suggest that you don't need to know so much, because this knowledge is not involved in junior high school learning, if you are interested in knowing, you can go to the library and look up the books yourself, or ask the teacher.

If you do, there will be a lot of knowledge involved, such as dissolution equilibrium, ionization, and so on.

I majored in chemistry in high school, but I don't remember much now, so I'll tell you what I remember

If you really don't know how to analyze an equation, do what the book says, and if the book says that the equation exists, you memorize it as existing, otherwise it doesn't exist. Because of the difference in knowledge between junior high and high school, sometimes junior high school will say that there is no reaction, high school will say that there is, and even the state of the product of some reactions has different answers in different versions of the book, which is really difficult for us to judge, so usually the teacher will tell us to follow our own textbook as the standard. When examining, these ambiguous knowledge will not be examined.

You should be talking about the metathesis reaction.

Metathesis reaction occurs under conditions when the product contains water, gas, or precipitation.

Whereas, both KCl and Na2SO4 are soluble, so they do not react.

Just add water and excess CO2, which is equivalent to adding excess carbonic acid.

Na2CO3 + HCl (a small amount) ==NaHCO3 + NaClNa2CO3 + CO2 + H2O ==2NaHCO3 does not have to be this condition, such as Na2SO3 + HClo = = Na2SO4 + HCl But the reaction you mentioned will not happen.

2.Preparation method:

1) Laboratory method:

to sodium carbonate. carbon dioxide is passed through.

Sodium bicarbonate is obtained.

na)2co3+h2o+c02=2nahco3

2) Industrial method: The intermediate products of Solvay's alkali production method and Hou's alkali production method are NaHCO3, which is taken out and dried.

Ready. 1. Ammonia-alkali method (Solvay alkali method).

A sufficient amount of ammonia is introduced into the saturated brine.

to saturation, and then under pressure to introduce CO2 (obtained by calcination of CaCO3), due to the solubility of NaHCO3 to allow the plexus.

Small, so the following reactions occur:

nh3+co2+h2o===nh4hco3

nacl+nh4hco3===nahco3↓+nh4cl

The precipitated NaHCO3 crystals are calcined to obtain Na2CO3:

2nahco3===

na2co3＋co2↑＋h2o

NH4Cl in the mother liquor plus slaked lime.

Ammonia can be used in order to be used in the aco-sensitive ring

2nh4cl＋ca(oh)==2

cacl2+2nh3↑＋2h2o

The advantages of this method: economical raw materials, continuous production, CO2 and NH3 can be used.

Disadvantages: A large amount of CaCl2 is of little use, the utilization rate of NaCl is only 70, and about 30% of NaCl remains in the mother liquor.

2. Combined alkali production method (Hou's alkali production method).

According to the principle that the solubility of NH4Cl is larger than that of NaCl at room temperature and smaller than that of NaCl at low temperature, at 278K 283K (5 10), salt fine powder is added to the mother liquor, and NH4Cl is crystallized and precipitated separately for nitrogen fertilizer.

The advantages of this method: the advantages of the ammonia-alkali method are retained, its shortcomings are eliminated, and the utilization rate of salt is increased to 96; NH4Cl can be used as nitrogen fertilizer; It can be combined with the synthetic ammonia Sakura plant to convert the raw gas of synthetic ammonia into CO2, eliminating the process of making CO2 from CACO3.

1) By heating. NaHCO3 heating can change to Na2CO3:

2NaHCO3 = Na2CO3 + H2O + CO22) by adding other substances such as carbon dioxide.

Pass in Na2CO3 solution in filial piety.

Into CO2, Na2CO3 can be converted into NaHCO3Na2CO3 + CO2 + H2O = 2NaHCO3

NaHCO3 and CaCl2 do not react.

Because Ca(HCO3)2 can be dissolved in water, it cannot react to form precipitate, gas and weak electrolyte, and does not meet the requirements of metathesis reaction.

If it is Ca(OH)2, it can react because HCO3- reacts with OH - to form CO32-, and then Ca2+ combines with CO32- to form CaCO3 precipitate.

(1) 1mol NaHCO3, Na2CO3 does not react (2) NaHCO3, 1mol NaCl,,。

The Na2CO3+HCl reaction in water is a two-step process. The first step is Na2CO3+HCl=NaHCO3+NaCl

If HCl is sufficient, continue NaHCO3 + HCl = NaCl + H2O + CO2

[Specific steps].

By heating. NaHCO3 heating can change to Na2CO3:

2NaHCO3 = Na2CO3 + H2O + CO2 by adding other substances like carbon dioxide. CO2 is introduced into Na2CO3 solution, and Na2CO3 can be converted to NaHCO3

Na2CO3 + CO2 + H2O = 2NaHCO3 sodium carbonate plus a small amount of hydrochloric acid to sodium bicarbonate Sodium bicarbonate plus sodium hydroxide to sodium carbonate or heat sodium bicarbonate to become water, carbon dioxide and sodium carbonate.

Depending on the acidity of the salts (acids) formed, the "weak ions" are hydrolyzed because in the hydrolysis of salts, the weaker the "weak ions", the more hydrolyzed. The acid corresponding to Na2CO3 is HCO3-;The acid corresponding to NaHCO3 is H2CO3;Acidic apparently H2CO3 HCO3-. The weaker the more hydrolyzed, so the degree of hydrolysis of Na2CO3 is greater, i.e.:

It is more alkaline and has a greater pH.

To do the experiment, directly prepare the two solutions with the same concentration, and use the pH test paper to measure.

(1) Na2CO3 solution is introduced into CO2

Na2CO3 + CO2 + H2O = 2NaHCO3 (2) sodium bicarbonate solid is decomposed into sodium carbonate by heating.

2NaHCO3 = (heated) Na2CO3 + CO2 (rising arrow) + H2O

1) By heating. NaHCO3 heating can change to Na2CO3:

2NaHCO3 = Na2CO3 + H2O + CO22) by adding other substances such as carbon dioxide. CO2 is introduced into Na2CO3 solution, and Na2CO3 can be converted to NaHCO3

na2co3 + co2 + h2o = 2nahco3

1.With a sufficient amount of carbon dioxide: CO2 + Na2CO3 + H2O = = 2NaHCO3

1) By heating. NaHCO3 heating can change to Na2CO3:

2NaHCO3 = Na2CO3 + H2O + CO22) by adding other substances such as carbon dioxide. CO2 is introduced into Na2CO3 solution, and Na2CO3 can be converted to NaHCO3

na2co3 + co2 + h2o = 2nahco3

It can be converted in the following ways.

1) Formula: Na2CO3 + CO2 + H2O = 2NaHCO3 (2) Fully heated to completely decompose sodium bicarbonate.

Formula: 2NaHCO3=Na2CO3+CO2+H2O(3) The gas is the carbon dioxide liberated by sodium bicarbonate, from which the mass of sodium bicarbonate can be found. The amount of carbon dioxide is that the amount of sodium bicarbonate is 2*, and its mass is, so the mass of sodium carbonate is 95 42 53g, and its mass fraction is 53 95.

If none of the above fails, a sufficient amount of carbon dioxide is introduced to convert sodium carbonate to sodium bicarbonate.

The formula is Na2CO3 + CO2 + H2O = 2NaHCO3.