What can be used to remove calcium carbonate?

Hydrochloric acid. Removal method: Because calcium carbonate can react with hydrochloric acid to form gas and solution, silica will not react and will not dissolve, so it is filtered and separated.

Equation: CaCo +2HCl=CaCl +Co +H 0Note: Dilute nitric acid can also be used, but sulfuric acid cannot be added casually, because CaSO4 is also precipitated.

Calcium carbonate is neutral, basically insoluble in water, soluble in hydrochloric acid. It is one of the most common substances on earth, found in aragonite, calcite, chalk, limestone, marble, travertine and other rocks, and is also the main component of animal bones or shells. Calcium carbonate is also an important building material and has a wide range of industrial uses.

Vinegar is used to remove limescale in the kitchen, and strong or weak acids can be used in the laboratory.

Calcium carbonate. Heating produces calcium oxide and carbon dioxide.

Carbon dioxide is a gas, and it is easy to get lost with the flow of air in an open container, so all that remains is calcium oxide, that is, calcium carboparaate in calcium oxide can be removed by heating.

Both calcium carbonate and calcium oxide can react with hydrochloric acid:

caco3+2hcl=cacl2+co2+h2o

cao+2hcl=cacl2+h2o

The removal method can be used by hand: the sample is placed in water, a sufficient amount of carbon dioxide is introduced, the mixture is heated to 80 degrees, and filtered for drying.

cao+co2=caco3

CaCO3 + CO2 (excess) + H2O = Ca(HCO3)2

Ca(HCO3)2 = CaCO3 + CO2 + H2O (more than 60 degrees).

Calcium carbonate uses:

1. Rubber: A large amount of calcium carbonate filled in rubber products can increase the volume of the product, thereby saving expensive natural rubber.

or synthetic rubber to reduce costs; Improved processability without affecting the vulcanization system of the rubber due to changes in the addition ratio; Improve the performance of vulcanized rubber, play a reinforcing or semi-reinforcing role; The hardness can be adjusted by varying the amount of calcium carbonate filling; Adjust the viscosity in the latex glue and the glue of the rubber, etc.

2. Plastics: adding calcium carbonate to plastics can play a skeleton role and improve the dimensional stability of plastic products; Improve the hardness and rigidity of plastic products; The addition of calcium carbonate can change the rheological properties of plastics.

Improve the surface gloss and surface flatness of products; Reduce the shrinkage rate and linear expansion coefficient of plastic products.

Creep properties, which contribute to the processing and forming of plastics; Improve the heat resistance of plastic products and improve the astigmatism of plastics.

Sex; Reduce the cost of plastic products.

The above content refers to Encyclopedia - Calcium Carbonate.

1) A small amount of sodium carbonate is mixed in the solid of sodium hydrogen oxide, and the method of removing impurities is --CO2!

Na2CO3 + CO2 + H2O ==2NaHCO32) CO2 gas is mixed with a small amount of HCl gas, and the method to remove impurities is to ---NaHCO3 cavity washing and dismantling gas!

nahco3 + hci ==naci + co2 + h2o

1) There is a small amount of sodium carbonate in the sodium bicarbonate solid, and the method of removing impurities is --CO2!

Na2CO3 + CO2 + H2O ==2NaHCO32) CO2 gas is mixed with a small amount of HCl gas, and the method of removing impurities is ---NaHCO3 washing!

nahco3 + hci ==naci + co2 + h2o

Because dilute hydrochloric acid can react with both calcium oxide and calcium carbonate.

cao+2hcl=cacl2+h2o

CaCO3+2HCl=CaCl2+CO2( )H2O,4,Calcium oxide reacts with water to generate calcium hydroxide and hydrochloric acid,2,Calcium oxide also reacts with hydrochloric acid,2,If dilute hydrochloric acid removes the small amount of calcium carbonate in calcium oxide,To dissolve solid impurities with dilute hydrochloric acid,After dissolution, the calcium chloride solution is obtained,Destroy the substance。 , 2, calcium oxide will also be known to react with dilute hydrochloric acid. ,2, first of all, we must figure out what is impurity, impurity, as the name suggests, is just to remove impurities, dilute hydrochloric acid can react with calcium oxide, calcium carbonate, so you can't use dilute hydrochloric acid, cao+2HCl=CaCl2+H2O CaCO3+2HCl=CaCl2+CO2 +H2O, if you want to remove calcium carbonate, you can heat the mixture, CaCO3 CaO+CO2, 2, because CAO+2HCl=CaCl2+H2O

Calcium oxide also reacted ·

It is necessary to use the method of high-temperature calcination,1, because calcium oxide is an alkaline oxide, which will react with acid to form salt and water, and will also react with water to become alkali (Ca(OH)2).

Therefore, it is generally calcined at high temperature, heated to 1000 degrees Celsius, and calcium carbonate will decompose into calcium oxide and carbon dioxide

caco3=cao+co2↑

This not only removes impurities, but also increases the yield of calcium oxide, which is generally an industrial method.

The lab is a bit more complicated...1. Because dilute hydrochloric acid and calcium oxide will also react, the calcium carbonate will be removed at the same time. It is best to perform high-temperature calcination.

0, dilute hydrochloric acid will react with calcium oxide, calcination is OK. ,0,CAO reacts with hydrochloric acid to generate calcium chloride and carbon dioxide, not to mention calcium oxide - all become calcium chloride, 0, because dilute hydrochloric acid can react with calcium oxide and calcium carbonate.

cao+2hcl=cacl2+h2o

caco3+2hcl=cacl2+co2（^)h2o

Because CA + 2 HCl = CACl2 + H2O

Calcium oxide also reacted ·

To use the method of high-temperature calcination, 0,

There is no calcium carbonate in the water. Because calcium carbonate is insoluble in water.

Only calcium bicarbonate is present in the water, which is produced by calcium carbonate + carbon dioxide + water, which is a soluble salt. This substance is harmful to the human body, so it should be removed.

Calcium bicarbonate is very unstable and can be decomposed by heating (i.e., boiling water) to reduce calcium bicarbonate to calcium carbonate. The reduced calcium carbonate adheres to the surface of the heating vessel and forms scale.

In this way, calcium carbonate is removed.

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Excessive calcium carbonate will make the hardness of the water high, and the tank of the boiling water container is easy to scale (including water heaters), and it is easy to get stone diseases after long-term drinking. It is recommended to choose a softened water purifier, which does not need to be too good, ordinary 3-level filtration can be done, there are two kinds of filter elements, one is the softening core, through the exchange of resin, replace the calcium ions in the water with the sodium ions in the filter element, so as to reduce the hardness of the water, the filter element can be used repeatedly, this water purifier ** is about 450. The other is the ultrafiltration element, the accuracy of the ultrafiltration element is microns, which can effectively remove impurities in the water, ** at about 700.

Ask how hardness water softens.

Question: I run a washing plant and use a lot of water.

Add an appropriate amount of hardness reducer. 2.Pre-leaching is performed with cation exchange natural resin to thoroughly soften the water hardness.

3.Partially change the water, mix with low hardness water or pure water. 2. When the water hardness is too low, the debugging method that can be used as appropriate is:

1.Debugging with hard water additives, e.g. adding the right amount of hardness booster.

2.It is appropriate to add a little coral sand or marble sand in the aquarium to increase the hardness of the water, but at the same time, it is necessary to pay attention to the change of water pH content. 3.

Partially change the water and mix with high hardness water.

With vinegar, wash off slowly and soak for a while. As long as it's acidic, it's fine.