Does the reaction of water and quicklime produce gas

The first dilute hydrochloric acid and rust

6HCl+Fe2O3=2FeCl3+3H20 There is no gas generation so the first one is not right

The third one stands to reason

cao+h2o=ca(oh)2 There is no gas, but the temperature of this reaction is so high, so the water in it will become water vapor, but this is a physical reaction, it is a chemical reaction, and it is a physical reaction that indirectly causes a physical reaction, and it is water that turns into water vapor

Done: Thank you

In addition, pure rust reacts with hydrochloric acid to produce hydrogenI see your brain is rusty, right?Do you want to add some hydrochloric acid to your brain to verify it?Don't mislead people here

If only from the perspective of the exam, it will not.

But. 1.There can be no pure rust in real life. There must be iron in it, and hydrogen will still be produced when exposed to it, and if there is no other answer, then this should be the answer.

2.Extended level knowledge ......Some quicklimes will have impurities of sulfide and phosphide, which will form pH3 and H2S after reaction, and a large amount of exothermic will also produce a lot of water vapor.

Dilute hydrochloric acid and rust produce hydrogen.

Dilute hydrochloric acid and sodium sulfate do not react.

Water and quicklime react but there is no gas.

In the absence of gas, Ca(OH)2 is generatedThat's because this reaction is exothermic to have water vapor.

Dilute hydrochloric acid and rust have hydrogen gas production, FeCl3 & H2

Dilute hydrochloric acid and rust with iron Fe+2HCl=FeCl2+H2 (gas symbol) The exam is not that difficult It should be this.

A large amount of heat is released to produce a white precipitate of calcium hydroxide.

The chemical formula is: CaO+H2O=Ca(OH)2.

Lime with the chemical formula CAO is a common inorganic compound. The usual preparation method is to calcine the natural rock with calcium carbonate as the main component at high temperature, which can be decomposed to produce carbon dioxide and calcium oxide, and the natural rock with calcium carbonate as the main component, such as limestone, chalk, dolomitic limestone, etc., can be used to produce lime.

Quicklime reacts with water to form calcium hydroxide solution, commonly known as clarified lime water; Colorless phenolphthalein is dropped into it, and phenolphthalein turns red; quicklime is calcium oxide, and hydrated lime is calcium hydroxide; Gives off a lot of heat.

Quicklime reacts chemically with water and is immediately heated to temperatures of over 300 °C. No other conditions are required for the reaction.

The process by which quicklime (CAO) reacts with water to form calcium hydroxide is called the maturation or digestion of lime. The product produced by the reaction, calcium hydroxide, is called hydrated lime or slaked lime. Quicklime reacts chemically with water and is immediately heated to temperatures of over 300 °C without the need for other conditions.

The chemical equation for the reaction of quicklime with water is: Cao + H2O = Ca(OH)2.

Properties of quicklime

Quicklime generally contains over-fired lime, which matures slowly, and if it is cured after the lime slurry is hardened, it will cause uplift and cracking due to the expansion produced by curing. In order to eliminate this hazard of over-fired lime, the lime should be "aged" for about 2 weeks after it is cured.

It is white (or gray, brownish-white) in shape, amorphous, and absorbs water and carbon dioxide in the air. Soluble in acid water, insoluble in alcohol. It is an inorganic alkaline corrosion article.

Quicklime reacts with water to produce calcium hydroxide (Ca(OH)2), commonly known as hydrated lime.

Structure. The main ingredient is calcium oxide (CAO) (calciumoxide; lime；quicklime)

Identification: Limestone: Calcium carbonate caCO3

Hydrated lime, slaked lime: calcium hydroxide Ca(OH)2

The main component of limestone is calcium carbonate CaCO3, while the main component of quicklime is Cao.

Quicklime reacts with water to produce calcium hydroxide (Ca(OH)2), commonly known as hydrated lime.

Equation cao+h2o=ca(oh)2

1、cao+h2o=ca(oh)2

2. The reaction is divided into two kinds, one is to pour water into quicklime powder, and the other is to put quicklime into water.

3. The first reaction phenomenon is that the water gradually boils and evaporates dry, and it becomes gray and turbid in the middle.

4. This is all the water fully reacted.

5. The second phenomenon is the gradual dissolution of lime and heat generation. This is fully reflected in all quicklime.

6. Ca(OH)2 is a strong electrolyte, but the solubility is not very good, so it should be slightly soluble; There will be a difference in the above phenomenon.

7. If the two are strictly equal and fully react at the same time, the phenomenon is close to the first case.

8. Note: After being open for a long time, it will react with carbon dioxide in the air to form calcium carbonate.

1. The name of the final solution obtained is calcium hydroxide solution, commonly known as clarified lime water.

2. Drop colorless phenolphthalein into it, and phenolphthalein will turn red.

3. Quicklime is calcium oxide, and hydrated lime is calcium hydroxide.

4. Emit a lot of heat.

Quicklime Introduction:

Also known as burnt lime, the main component is calcium oxide (CAO), which is usually made by calcining natural rocks with calcium carbonate at high temperatures to decompose carbon dioxide and calcium oxide.

All natural rocks with calcium carbonate as the main component, such as limestone, chalk, dolomitic limestone, etc., can be used to produce lime. In coastal areas, shells are used as raw materials, which are fired into shell ash and used as quicklime.

The main component of quicklime is calcium oxide, which reacts with water to form calcium hydroxide and at the same time releases a large amount of heat.

cao ten h2o = ca(oh)2

Quicklime reacts with water to produce calcium hydroxide, carbon dioxide and heat, which is really helping you look forward to it

Summary. Quicklime reacts chemically with water and is immediately heated to temperatures above 300° C. No other conditions are required for the reaction. The chemical equation for the reaction of quicklime with water is: Cao +H20=Ca(OH)2.

The quicklime reacts chemically with the water and is immediately heated to temperatures above 300° C. No other conditions are required for the reaction. The chemical variance of quicklime reacts with water is: cao +h20=ca(oh)2.

The process by which quicklime (CAO) reacts with water to produce calcium hydroxide is called the maturation or digestion of lime. The product produced by the reaction, calcium hydroxide, is called hydrated lime or slaked lime. Lime When lime is cured, a large amount of heat is released, and the volume is doubled.

The lime with good calcination and high calcium oxide index content matures faster, and the amount of heat released and the volume increase more. There are two commonly used methods of slaked lime on the construction site: slaked lime slurry method and slaked lime powder method.

Depending on the amount of water added, lime can be matured into slaked lime powder or lime paste. The theoretical water requirement for lime curing is 32% of the lime weight. In the raw lime, 60% 80% water is added evenly to obtain slaked lime powder with fine particles and uniform dispersion.

If it is cured with excessive water, it will obtain lime paste with a certain consistency. Lime generally contains flint lime, flint lime cures slowly, and if it is cured after the lime slurry hardens, it will cause uplift and cracking due to the expansion produced by curing. In order to eliminate this hazard of over-fired lime, the lime should be "aged" for about 2 weeks after it is cured.

The hardening of the lime slurry consists of two simultaneous processes: drying, crystallization and carbonization. The lime slurry dries due to the evaporation or absorption of water, and in the pore network in the slurry, capillary pressure is generated. It makes the lime particles more compact and gains strength.

This strength is similar to the strength gained by the loss of water in clay, and its value is not large, and it is lost when exposed to water. At the same time, water loss due to dryness. The calcium hydroxide solution in the slurry next to the lead is supersaturated, and the calcium hydroxide crystals are crystallized to produce strength; However, the number of precipitated crystals is small, and the strength does not increase much.

In the atmosphere, calcium hydroxide reacts with carbon dioxide in the air to form calcium carbonate in a humid state and releases moisture, that is, carbonization.

Your quicklime may have spoiled, and the lime in the lime desiccant is spoiled. Dissolve it in water and then filter it, and you will get clear lime water, which will be turbid when blown with a straw. That water is the clarification of lime water.

I did my experiments with lime desiccant in seaweed. First slide.