Formaldehyde contains the number of aldehyde groups, what is aldehyde group?

Ah, one. How could it be two? You can look at both sides, but there is only one.

On the third floor, after the experimental reaction, it is acid-formed, and then it is reacted. How can it be counted.

Two, write the structural formula, block the hydrogen on the right, the part on the left is equivalent to an aldehyde group, block the hydrogen on the left, and the right side is also equivalent to an aldehyde group. Experimental evidence is that in the formaldehyde silver mirror reaction, the ratio of a formaldehyde to the generated silver is 1:4, in fact, after you react the hydrogen on the left, the remaining aldehyde group on the right is still an aldehyde group, which can also play the role of an aldehyde group, so it can be regarded as a binary aldehyde.

Acetaldehyde is different, after the aldehyde hydrogen is reacted, there is no aldehyde structure in the acetaldehyde molecule, so when the silver mirror reaction occurs, the ratio of it to the silver generated is 1:2.

Normally, when -cho is ammoniacized by silver, 2mol of silver will be generated.

And the ratio of formaldehyde to silver is 1:4, so formaldehyde is a dibasic aldehyde.

The one who refuted me, if you say that the silver mirror reaction does not occur because of the aldehyde group, then explain why formic acid can occur silver mirror reaction, and what functional groups does formic acid contain? You say that you can look at both sides, but there is only one functional group, so according to your statement, formic acid only contains a carboxyl group, so please explain: why can formic acid undergo a silver mirror reaction?

Therefore, when calculating the number and type of functional groups, the part of the two functional groups contained in common can be expressed as the substance containing these two functional groups, which is common in the calculation of the number of functional groups in formaldehyde. It can be expressed as: two aldehyde groups in formaldehyde share a carbonyl group, formaldehyde contains two aldehyde groups, and formaldehyde is a dibasic aldehyde.

This is also said in many reference books today.

Aldehydes are compounds that are composed of hydrocarbon groups linked to aldehyde groups to form acre, abbreviated as RCHO

The general formula of aldehydes is RCHO, the general formula of saturated monoaldehyde is CNH2NO, the molecular formula of acetaldehyde is C2H4O, the simple structure formula is CH3CHo, the functional group is aldehyde group (-CHO), and the aldehyde group is a group composed of carbonyl group (-Co-) and a hydrogen group.

The reaction equation between aldehyde and new copper hydroxide can be simply expressed as follows:

The principle of the reaction is:

1. The aldehyde group DAO-CHO has strong reducibility and can be oxidized by Cu(OH)2 with weak oxidation (most of the other groups cannot be oxidized due to insufficient reducibility). An alkaline environmental solution is required for the reaction.

2. This is the famous Fehling reaction, which is used to identify fatty aldehydes. It is required to add the sample to be tested to the newly prepared Cu(OH)2 alkaline suspension, mix well and heat, if a brick-red precipitate is produced, it proves that there are fatty aldehydes in the sample to be tested by bucket milling.

For example, acetaldehyde and a newly configured copper hydroxide reaction:

The reaction is a two-step reaction and the equation is:

1、cuso4 + 2naoh = cu(oh)2↓ +na2so4 ；

2. CH3CHO + 2Cu(OH)2 + NaOH = empty CH3Coona + Cu2O + 3H2O, the reaction condition is heated

Formaldehyde removal method refers to an air treatment method that decomposes formaldehyde pollutants into carbon dioxide and water at room temperature and releases them into the air in a molecular state through a series of measures such as green plant adsorption, air purification, photosynthetic oxidation, and physical ventilation. If you want to know more details, you can consult Guangzhou Yousu Environmental Protection Technology****. Guangzhou Yousu Environmental Protection Technology Co., Ltd. is a high-tech enterprise specializing in the field of indoor environmental health, a chain organization integrating scientific research, production, sales and engineering, with reliable technical strength and professional team, welcome friends to come to consult!

The molecular weight of formaldehyde is 30, and one mole of formaldehyde contains 1 molar aldehyde group. The amount of aldehyde group = mol.

Formaldehyde test strips are very inaccurate.

Before moving into a new house, it is recommended to do a formal formaldehyde test (in the case of a new house, only formaldehyde is in the adhesive of the furniture board, which is difficult to volatilize, and other harmful gases, as long as the furniture is in order, do not rush to move in, and if the ventilation is good, it is generally basically gone for one or two months).

1. If the general family detects formaldehyde, there is a reference report, the report does not have a legal effect, only for personal reference, it is recommended to find a third party only to detect, not to do formaldehyde treatment institutions.

1. The portable formaldehyde detector is inaccurate, it is a big fool, exhale, and the data is soaring.

2. Formaldehyde test strip, the detection principle is established, but the quantitative gas is not collected, and the unit mg m3 cannot be accurately calculated.

3. The company that both detects and governs is completely a pit, and if the test results do not exceed the standard, they will have no governance business.

4. Therefore, it is recommended that you find a third-party organization that only tests and does not do formaldehyde treatment. There are several such methods, such as finding some formaldehyde detectors that can be rented with high precision tens of thousands of yuan, and there are some small social testing institutions, which can be door-to-door testing.

2. If it is a kindergarten, hospital, school and other places, a CMA test report with legal effect may be required. Only the testing agency recognized by the state can present the test report with the CMA seal, which has legal effect and can be publicized. (Local tyrant families, or those who have disputes over decoration furniture, can also choose the CMA test report, which costs about 2,000 yuan per family).

In addition to formaldehyde, there are two situations (other harmful gases that are not easy to volatilize can also be used for reference), the first is to treat the symptoms, and the second is to treat the root cause. The best way to treat the symptoms is to ventilate, and you can purchase a fan to assist in ventilation. Formaldehyde is soluble in water, and the best way to cure the root cause is to scrub the furniture with clean water, mop the floor diligently, and pass the water for household items, curtains and mats, etc., all over the water, and accelerate the improvement of the new house environment.

If some furniture is too high in formaldehyde, it is recommended to buy a formaldehyde removal spray or seal the surface with wood wax oil. In the end, it really doesn't work, just ask a professional formaldehyde removal agency, but always remember that formaldehyde is stored in the glue of furniture panels, which is slowly volatilized, and there is no way to volatilize formaldehyde at one time.