The third chemical is lime water and carbon dioxide

I'm in my third year of junior high school now

So I'll tell you the most basic, and besides, I don't know the deeper, Hehe.

The teacher told us that when we talk about lime water, we have to think of carbon dioxide, and when we talk about carbon dioxide, we have to think of lime water, and the main component of lime water is calcium hydroxide solution, and about calcium carbonate, it is the reactant of lime water and carbon dioxide.

Calcium hydroxide (lime water) + carbon dioxide to generate calcium carbonate + water, just know these, and there is, calcium hydroxide is Ca(OH)2, carbon dioxide is CO2, calcium carbonate is CaCO3 and water is H2O, these are all to remember, come on, in fact, chemistry is quite interesting,

Carbon dioxide is a neutral substance, non-combustible, non-toxic, and cannot supply respiration, and it reacts with alkaline calcium hydroxide to form calcium carbonate. Calcium carbonate is an acidic substance that can react with hydrochloric acid or sulfuric acid to form calcium chloride and carbonic acid or calcium sulfate and carbonic acid. Carbonic acid is very unstable and easily decomposes into carbon dioxide and water.

Carbon dioxide is used to extinguish fires and can also cool them down into dry ice, which is used for artificial rainfall.

Calcium hydroxide is lime, using the property that calcium hydroxide will become calcium carbonate when it meets carbon dioxide, we can use it to detect carbon dioxide. We can also paint the walls with calcium hydroxide, and when the calcium hydroxide reacts with carbon dioxide in the air, the walls turn white.

Calcium carbonate is the marble, shell and other substances in life.

Carbon dioxide: CO2 Calcium hydroxide: Ca(OH)2 Calcium carbonate: CaCO3

Calcium hydroxide is a base that produces calcium ions and hydroxide ions when ionized.

Lime water is an aqueous solution of calcium hydroxide.

Carbon dioxide is an alkaline oxide that reacts with lime water to form calcium carbonate.

Calcium carbonate is a carbonate that is poorly soluble in water.

The main component of lime water is calcium hydroxide, and the chemical equation for the reaction with carbon dioxide is:

Ca(OH)2 CO2 = CaCO3 (precipitate).

h2o

A small amount of carbon dioxide produces a white precipitate of positive salts:

CO2 + Ca(OH)2 = CaCO3 + H2O CO2 overload of acid salts:

2co2+ca（oh）2=ca（hco3）2

ca(oh)2+co2=caco3+h2o

Lime water reacts with carbon dioxide to produce calcium carbonate and water.

The reaction of lime water and carbon dioxide can be divided into the following two cases.

1. A small amount of carbon dioxide.

CO + Ca(OH) Caco +H o When carbon dioxide is small, carbon dioxide only reacts with calcium hydroxide to form calcium carbonate precipitate, so as carbon dioxide only reacts with calcium hydroxide, the solution will gradually become turbid.

2. Excess carbon dioxide.

CO +Ca(OH) Caco +H OCO +CACO +H O Ca(HCO) When there is an excess of carbon dioxide, the carbon dioxide reacts with calcium hydroxide first, and when the calcium hydroxide reaction is complete, the excess carbon dioxide continues to react with calcium carbonate.

1. Carbon dioxide.

Chemical equation for reaction with lime water: CO2 + Ca(OH)2==CaCO3 +H2O.

2. When carbon dioxide is passed into the clarified lime water, the clarified lime water will become turbid, and if the excess carbon dioxide continues to be introduced, the excess carbon dioxide will be mixed with calcium carbonate.

Continue the reaction: CO2 + CaCO3 + H2O = Ca(HCO3)2, and the raw code becomes soluble calcium bicarbonate, so that the turbid lime water denier lead becomes clear.

Quicklime is a block solid, and the one used to paint the wall should be hydrated lime, after adding water, quicklime reacts with water to form calcium hydroxide (hydrated lime), and uses hydrated lime to react with carbon dioxide in the air to produce white hard calcium carbonate, the chemical formula of hydrated lime is Ca(OH)2.

Calcium hydroxide is a strong alkali, which has the ability to kill bacteria and antiseptic, and has a corrosive effect on ** and fabrics. Calcium hydroxide has a wide range of applications in industry. It is commonly used as a building material, and is also used as a fungicide and chemical raw material, etc.

A brief history of research. Lime is the earliest cementitious material used by human beings. The ancient Greeks used it for construction in the 8th century BC, and China also began to use lime in the 7th century BC.

Many of the ancient ornate frescoes and rammed foundation sites that have been preserved have been made of lime. The construction of the Great Wall of Qin is also an example.

China is one of the earliest countries to produce and utilize lime. According to archaeological data, smooth and solid walls and floors plastered with lime have been found in many sites of Longshan culture in the Yellow River Basin of China (c. 2800-2300 BC). According to C-14, the lime used in the Longshan period site has been artificially calcined.

Lime water reacts with carbon dioxide to form calcium carbonate precipitate and water. This reaction principle is mainly used in the construction industry. If carbon dioxide is introduced, the turbid lime water will become clear again, because the excess carbon dioxide will react with calcium carbonate and water to form soluble calcium bicarbonate.

Clarified lime water refers to a dilute solution of calcium hydroxide, while turbid lime water refers to an aqueous solution of calcium carbonate and calcium hydroxide.

The function of lime water: adding clarified lime water to the rice shrimp is mainly to make the rice milk coagulate and smooth, increase the natural fragrance and sweetness of the rice shrimp, promote the richness of the taste, change the nature of the food, make it change from acidic food to alkaline food, and become a low-calorie healthy food. In addition, lime water rolling also has the effect of disinfection and sterilization, as a safe and environmentally friendly low-cost food additive, there is no substitute.

Lime water is also widely used in laboratories, which can detect carbon dioxide and pass colorless and odorless gas into clear lime water, if the solution is large fission and turbid, it indicates that the gas contains carbon dioxide.