Is cannon sulfuric acid in blue alum water absorbent or dehydrated?

Absorb water because blue alum is inorganic.

Middle school textbooks and university textbooks all say that concentrated sulfuric acid can also take hydrogen and oxygen from some organic compounds that are equivalent to the composition of water molecules, and carbonize these organic substances, which is called the dehydration reaction of concentrated sulfuric acid.

Of course, it is water absorption, and if it is dehydration, it must be required that the substance itself has oxygen and hydrogen, and sodium carbonate does not.

It is water absorption, water absorption is a physical reaction, and dehydration is a chemical reaction.

It should be dehydrated, the blue alum itself already has water, and it can't be sucked

Dehydration is charring.

Water absorption, of course.

Dehydration, it is obvious, the teacher taught.

The addition of concentrated sulfuric acid to the blue alum shows the water absorption of concentrated sulfuric acid.

The water absorption effect of concentrated sulfuric acid refers to the strong combination of concentrated sulfuric acid molecules and water molecules to form a series of stable hydrates and release a large amount of heat; Concentrated sulfuric acid can not only absorb general free water (such as water in the air), but also absorb water in some crystalline hydrates (such as CuSO4·5H2O, Na2CO3·10H2O).

When the concentrated sulfuric acid exhibits dehydration, the hydrogen atom and oxygen atom in the dehydrated substance are seized according to the ratio of the number of hydrogen and oxygen atoms in the water molecule (2 1); The substances that can be dehydrated by concentrated sulfuric acid are generally organic matter containing hydrogen and oxygen elements, among which the organic matter in sucrose, wood chips, paper scraps and cotton and other substances is dehydrated to form black charcoal (carbonization).

This is the water absorption of concentrated sulfuric acid, which absorbs water molecules. Dehydration, on the other hand, refers to the removal of water molecules in the ratio of H and O, and is not really a water molecule.

Dehydration is a chemical change, and water absorption is a physical change. Is this true?

Analysis: Because dehydration removes the hydrogen and oxygen elements from the substance, new substances are generated, so it is a chemical change.

Water absorption is generally a physical change, however, when concentrated sulfuric acid absorbs the crystalline water in the substance, a chemical change occurs. For example, blue bile alum becomes a white solid when it encounters concentrated sulfuric acid, and a chemical reaction occurs, CuSO4·5H2O=CuSO4+5H2OIt should be noted here that crystalline water itself exists in the form of water molecules, so it belongs to water absorption.

This issue has been debated for a long time, and many people have published ** on impurities, some say it is absorbent, some say it is dehydration.

Water absorption is the absorption of water molecules in the free state of the substance; Dehydration is the removal of the atoms of the two elements H and O according to the ratio of 2:1, which is called "dehydration", in fact, there is no water, only the atoms are removed.

As for the reaction between concentrated sulfuric acid and bile alum, I thought it should be caused by water absorption.

landlord discretion.

Dehydration. Concentrated sulfuric acid can take hydrogen and oxygen from some organic compounds, which are equivalent to the composition of water molecules, and carbonize these organic substances, which is called the dehydration reaction of concentrated sulfuric acid.

I think it's dehydration, because the bile alum is copper sulfate pentahydrate, and the water in it is crystal water, and the concentrated sulfuric acid turns the bile alum into copper sulfate, and the substances have changed, and there has been a chemical change, which is dehydration. If it is water absorption, it is water absorption, and a physical change should occur.

Our teacher said that it was water absorption, and the water of gallium existed in the form of water molecules.

What is the difference between water absorption and dehydration?

Water absorption: refers to the property of concentrated sulfuric acid to absorb water, water vapor or crystalline water. (Water leaves in molecular form) Dehydration:

It refers to the property of concentrated sulfuric acid to remove the hydrogen and oxygen elements in organic matter according to the ratio of 2:1 to the number of atoms. ("Water" leaves in atomic form, and the original substance does not contain water molecules).

The key is to see if there is "ready" water.

Water absorption, which absorbs the crystal water in CuSO4·5H2O, belongs to the water absorption of H2SO4. The water in sugarcane is bound to water, which is composed of tissue fluid, vacuoles, etc., and the water is removed to affect the overall structure, and the water is dehydrated by H2SO4.

Dehydration. Because dehydration is manifested as the chemical property of concentrated sulfuric acid, and water absorption is a physical property, copper sulfate pentahydrate becomes copper sulfate and has undergone chemical changes, so it should be dehydrated.

Water absorption, blue if there is water.

Water absorption, which dehydrates the substance in the ratio of hydrogen and dioxygen, is called dehydration.

Cholelum is copper sulfate pentahydrate with crystalline water, while concentrated sulfuric acid is absorbent, which will make it white, and the dehydration of concentrated sulfuric acid refers to'Carbonization'If concentrated sulfuric acid drops on the paper, the paper will turn black. (I'm a chemist, and the answer is absolutely credible).

Dehydration and water absorption correspond to physical and chemical changes, respectively. Dehydration is a chemical change that removes the water from the molecule.

Absorbent. Dehydration is the removal of hydrogen and oxygen from organic matter in a certain proportion of organic matter.

It is absorbent because there is no substantial chemical change when it is put into it.

Absorbent dehydration is not this concept.

It is dehydration, dehydration is a chemical change, the process of dehydration is a chemical change, this process generates new substances, such as concentrated sulfuric acid can remove hydrogen and oxygen in organic matter (including wood, cloth, **, sugars, etc.) in a ratio of 2 to 1 (in the form of water), and finally only carbon is left (sometimes there are other elements, or hydrogen and oxygen are not removed) (this process is called carbonization).or concentrated sulfuric acid can remove crystalline water from crystals with crystalline water (such as copper sulfate pentahydrate) to form crystals without crystallized water.

Water absorption, this process is a physical change (some are also chemical changes, such as concentrated sulfuric acid can absorb water vapor in the air around it, forming a series of hydrous compounds, on the other hand, sulfuric acid dissolves itself in the water in it, making itself thin).For example, sodium hydroxide solid has strong hygroscopicity, as long as a few minutes, it will absorb the water vapor around it, and the sodium hydroxide will dissolve itself in the absorbed water and become a concentrated solution of sodium hydroxide.

Concentrated sulfuric acid can not only dehydrate, but also carbonize substances (chemical reaction); The absorbent absorbs only the moisture of the substance, and the substance does not change (physical change).

See if this reaction is not catalyzed by concentrated sulfuric acid, if so, it will also show dehydration, such as ethanol to ethylene, nitrification of benzene; If dilute sulfuric acid or even sodium hydroxide is used, such as esterification, ester hydrolysis, it also exhibits water absorption.

The easiest:

If one of the molecules of one of your substances drops H2O, it must be a dehydrating agent.

If two substances combine with each other and drop H2O, it must be a water absorbent high school and before, enough to use!

Dehydration: There is no water, water is produced because of sulfuric acid.

Water absorption: There is water in the first place, but sulfuric acid sucks it up.

Ethanol is heated with concentrated sulfuric acid to become ethylene. Concentrated sulfuric acid acts as a dehydrating agent in the elimination process. But at the same time, it is also used as a water absorbent, because water is produced, and concentrated sulfuric acid absorbs water, so that the reaction is conducive to the right.

The same is true for esterification. At esterification, dehydration; After dehydration, water is absorbed to shift the balance to the right, which is conducive to the formation of esters.

Methanol and ethanol are coheated and concentrated sulfuric acid and this reaction has never been heard of.

Let's see if there's any chemistry.

Personally, I feel that we should see whether the water molecule comes from a single reactant or multiple reactants, from a single reactant, such as alcohol elimination to obtain alkene, which is a dehydrating agent, but also a catalyst and a water absorbent, esterification, nitrification is a catalyst and a water absorbent, not called a dehydrating agent. That is, they correspond to what you call the elimination of the reaction dehydrator and replace the reaction absorbent. However, the formation of alcohol into ethers, also known as intermolecular dehydration, is very ......

The main difference between water absorption and dehydration is that dehydration produces new substances.

The H and O in the gallium originally exist in the form of water molecules, so they absorb water.

Dehydration is the original H and O are the original molecular components, which are taken out in a 2:1 ratio to form water.

Dehydration refers to the concentrated sulfuric acid that removes the oxygen and hydrogen elements in the substance in a ratio of 1:2, and water absorption is to directly absorb the water in the substance, so it is water absorption.

It is dehydration rather than water absorption.

In organic reactions, such as the reaction of ethanol dehydration to ethylene, the nitrification reaction of benzene, the dehydration of sucrose, etc., the role of concentrated sulfuric acid is a dehydrating agent and catalyst. In esterification reactions, it is a water absorbent and catalyst.

Concentrated sulfuric acid is dehydrated in organic reactions, such as acetic acid dehydrated into ethylene.