The chemical formula of sodium bicarbonate and how to make sodium bicarbonate

2.Preparation method:

1) Laboratory method:

Sodium bicarbonate is obtained by measuring carbon dioxide into sodium carbonate.

na)2co3+h2o+c02=2nahco3

2) Industrial method: The intermediate product of Solvay's alkali production method and Hou's alkali production method is NaHCO3, which is obtained by taking it out and drying.

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

A sufficient amount of ammonia is introduced into the saturated brine to saturation, and then CO2 (obtained by calcination of CaCO3) is introduced under pressure, because the solubility of NaHCO3 is 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 can be **ammonia, so that it can be recycled:

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 ammonia plant to convert the raw gas CO of synthetic ammonia into CO2, eliminating the process of making CO2 from CACO3.

Made from the most primitive materials:

1.Prepare NaCl (don't say no), two carbon electrodes (take it in the battery).

Egg shells, acetic acid, toilet paper.

2.Naoh:

1> Prepare concentrated NaCl solution: Heat the water, add NaCl, stir and stir until no more NaCl is dissolved.

2> Connect the carbon electrode to the wire, put it in the concentrated NaCl solution, and connect the electrode to the direct current.

Positive electrode: 2cl- -2e- = cl2 negative electrode: 2h+ +2e- =h2

Total reaction: 2NaCl + 2H2O == Electrolysis === 2NaOH + H2 + Cl2

Cl2 is insoluble in concentrated NaCl solution.

3.After a certain period of reaction (the required time can be calculated according to the current and NaCl), the obtained NaOH solution is filtered (toilet paper is used as filter paper), and CO2 (eggshell + acetic acid) is introduced

The first step reaction: 2NaOH + CO2 = Na2CO3 + H2O

The second step reaction: Na2CO3 + H2O + CO2 = 2NaHCO3

2.Preparation method: Sodium bicarbonate is obtained by measuring carbon dioxide into sodium carbonate.

na)2co3+h2o+c02=2nahco3

NaHCO3, sodium bicarbonate is obtained by measuring carbon dioxide into sodium carbonate.

Chemical Formula: NaHCO3 Chemical Equation: NAOH+CO2=NaHCO3

The chemical equation for the preparation of sodium bicarbonate. Preparation method: (1) Laboratory preparation method:

Sodium bicarbonate (Na) 2CO3 + H2O + C02 = 2NaHCO3 (2) Industrial preparation method: The intermediate products of Solvay's alkali production method and Hou's alkali production method are NaHCO3, which is obtained by taking it out and drying.