Which of the following substances are organic acids?

The so-called organic matter usually refers to the compound containing carbon elements, or hydrocarbons and their derivatives are collectively referred to as organic matter. Hence acetic acid is counted as an organic acid. Inorganic is an abbreviation for inorganic compounds, which usually refer to compounds that do not contain the element carbon.

A small number of carbon-containing compounds, such as carbon monoxide, carbon dioxide, carbonates, cyanide, etc., are also inorganic. Inorganic substances can be broadly divided into oxides, acids, alkalis, salts, etc. Since carbonic acid is formed by the dissolution of carbon dioxide in water, carbonic acid is counted as an inorganic acid.

Carbonic acid is an inorganic substance, let's look at the definition of organic matter, except for carbon dioxide, carbonic acid, carbonate, bicarbonate, carbon monoxide, metal carbides and other most carbon-containing compounds are organic matter.

The one containing the carboxyl group is an organic acid The molecular formula used in carbonic acid in organic chemistry is indeed one carboxyl group and one hydroxyl group, or it is considered to be one carbonyl group and two hydroxyl groups. But it shows the properties of inorganic matter, so it is not classified as organic.

Excerpt: In the basic definition, organic matter refers to compounds containing carbon elements, but there are a few compounds such as carbon dioxide, carbonic acid, carbonate and other substances whose chemical properties are very similar to inorganic substances, such as the release of carbonic acid in case of strong acids, so it is customary to classify these few carbon-containing compounds as inorganic, carbonic acid does not have the characteristics of organic acids such as degrouping, addition reactions, etc., so it is not classified as organic acids.

Encyclopedia: Organic acids are compounds that contain a carboxyl group (COOH) in their molecular structure. It is widely distributed in the leaves, roots, and especially fruits of Chinese herbal medicines, such as black plum, schisandra, raspberry, etc.

Common organic acids in plants include aliphatic monocarylic acid, diary, polycarboxylic acids such as tartaric acid, oxalic acid, malic acid, citrate acid, ascorbic acid (i.e. vitamin C), etc., as well as aromatic organic acids such as benzoic acid, salicylic acid, caffeic acid (caffelc acid), etc.

a. Hydrochloric acid is not an organic acid, so it is wrong;

b. Sulfuric acid does not belong to the tour of the game, so it is wrong;

c. Although carbonic acid contains carbon elements, its properties are similar to inorganic substances and belong to inorganic acids, so it is wrong;

D, CH3 COOH belongs to organic acids, so it is correct to choose D

A is composed of metal ions and acid ions, does not contain hydrogen elements, and belongs to salt compounds, so A is correct

Sulfuric acid in B is a common acid in Xianglu, which consists of H+

and sulfate ions, which belong to acids, so B is wrong C is composed of H+ and nitrate ions, which is acid, so C is wrong D, which is composed of H+ and phosphate ions, and belongs to acid, so D is wrong so A

Answer] Qi Shuyou: d

The test point of this question is the classification and physicochemical properties of organic acids. Organic acids are a class of compounds containing carboxyl groups (excluding amino acids), which can be divided into three categories: aromatic, aliphatic and terpenoid organic acids according to their structural characteristics. Organic acids are widely distributed in the plant kingdom, and most of them are formally present in combination with potassium, sodium, calcium and other ions or alkaloids of the genus A. japonicus, and some are combined into esters.

Except for a few low-molecular-weight fatty acids, most organic acids are lipophilic compounds, which are easily soluble in lipophilic organic solvents but insoluble in water. The lower fatty acids and unsaturated fatty acids are mostly liquid, and the higher fatty acids, aliphatic dicarboxylic acids, aliphatic tricarboxylic acids and aromatic acids are mostly solids.

A. All cations ionized by KCl are potassium ions, which do not belong to acids, but to salts, so the spine argument A is wrong;

b. Oxygen is not a compound and does not belong to acid, so B is wrong;

c. The cations ionized by NaOH are all sodium ions, which do not belong to acids, so C is wrong;

d. The cations ionized by nitric acid are all hydrogen ions, which belong to acids, so d is correct, so cherry blossoms are selected and d

A. HCL is composed of H+

and chloride ions, socks or grinding are acids, so the option is wrong

b、h2so4

It is composed of H+ and sulfate ions, which is an acid, so the option is wrong C, Na2SO4

It is a compound composed of metal ions and acid ions, which belongs to salts, so the option is correct D, Hno3

It is composed of H+ and nitric acid source root ions, which is an acid, so the option is wrong, so choose C

The composition of the acid must contain acid groups.

Acids are compounds that are all cations produced during ionization, or substances that dissolve in water and release protons to form Ho are also acids. The higher the concentration of HO, the more acidic the solution becomes. Ho is present even in pure water at a concentration of 10 mol l.

This is caused by protons running from one water molecule to another.

In the traditional sense, the concentration of Ho also depends on the concentration of hydrogen ions, although most of the hydrogen ions in aqueous solutions are in the form of HO. The narrow definition of acid in chemistry is: the cations ionized in an aqueous solution are all hydrogen ion compounds.

Proposed by Arrhenius, this theory is known as Arrhenius' acid-base theory.

Acids are generally corrosive. At a certain temperature, the ionization degree of weak acid increases due to the thinning of the solution, and it is completely ionized when it is diluted indefinitely. The ionization of multiple weak acids is carried out step by step.

Water is an excellent solvent for inorganic compounds, and ions are strongly attracted to water molecules and stabilized. There are certain requirements for metathesis reactions, and the reactants must be soluble in water.

Acids are widely used, and many industries and laboratories use acids, commonly used sulfuric acid, hydrochloric acid, and nitric acid. Many chemical reactions take place in aqueous solutions, and pH is important. If carbon dioxide is introduced into a solution containing Ca2+, whether calcium carbonate precipitate can be obtained depends on the pH value of the solution, and some reactions must be carried out at a constant pH value, for which a solution of weak acid (alkali) and its salt is commonly used as a buffer solution.

Classification of acids:

1. According to organic and inorganic, it is divided into inorganic acid and organic acid.

2. According to whether it contains oxygen, it is divided into oxygenated acid and anaerobic acid.

3. According to the number of H+ that can be ionized from the acid molecule.

4. According to the strength of acidity, the acid is divided into strong acid, medium strong acid, and weak acid (whether it can be completely ionized).

5. According to whether it is the central Zen bird atom, the electrons are divided into strong oxidizing acids and non-strong oxidizing acids.