Which of the following compounds is the most acidic

RCOOH is the strongest, and carboxylic acids are more acidic than carbonic acid.

If OH is attached to the hydrocarbon group (that is, alcohol), it is basically not acidic, and does not react with NaOH, but it can have a substitution reaction with Na; If attached to the benzene ring (i.e., phenol) it is very weakly acidic, weaker than carbonic acid, but not acid.

Water is neutral because pure water is weakly ionized, and for every molecule of hydrogen ions generated, one molecule of hydroxide is formed.

is C, because C can react with ETO- to become a carboanion, indicating that C is more acidic than B, while B can react with active metals, and AC cannot.

In the negative ions of C, the negative charge is more dispersed, and the negative ions are more stable and more acidic

In the aqueous solution, water and ethanol are neutral substances, carbonate pka=, phenol pka=, and carbonic acid is stronger.

Experimentally, sodium hydroxide solution was added dropwise to the turbid phenol aqueous mixture until it was clear, and then CO2 was introduced, and the solution was turbid (C6H5ONA+H2O+CO2==C6H5OH+NaHCO3), indicating that the carbonic acid was stronger.

This question involves the acidity of alcohols, acids, halogenated acids, alcohols are weaker acidic than water, carboxylic acids are weak acids, acidic stronger than alcohols, and halogenated acids are stronger acidic than carboxylic acids, because halogens are electron withdrawing groups, and the influence of electron withdrawing induction effect will enhance the acidity of carboxyl groups, and the more halogens there are, the closer they are to the carboxyl group, the stronger the acidity. Therefore, the order of acidity in this question from strong to weak is d, c, b, and a.

I think it's c, and h added to c in the middle of the two carbonyl groups is easily given in proton form.

The most acidic compound is carbonic acid.

Carbonic acid is a dibasic weak acid with the chemical formula H2CO3 and a very small ionization constant. At room temperature and pressure, the concentration of carbon dioxide saturated solution is about , pH is, pka1=, pka2=.

Sometimes, carbonic acid can also cause problems in our daily lives. Carbon dioxide gas on the ground dissolves in water to form carbonic acid. When surface water seeps into the ground, carbonic acid is also carried to the ground, and chemically reacts with calcium carbonate, which is insoluble in water, in underground limestone to form calcium bicarbonate that is soluble in water.

Water containing calcium in bicarbonate is called "hard water", so underground water is considered "hard water". The water in the rivers does not contain calcium bicarbonate and is not "hard water".

In some places, tap water is used as groundwater, and when the water is boiled, the calcium bicarbonate in the water is heated and decomposed into calcium carbonate, carbon dioxide and water. Calcium carbonate is a sediment that is insoluble in water, it is deposited on the walls of kettles and boilers, and over time it becomes a layer of white and very hard substance, called pot scale (commonly known as water alkali).

This layer of calcium carbonate has poor thermal conductivity, so fuel is wasted when boiling water. If the scale in the boiler and pipes is too thick, there is also a danger of **. Therefore, in industrial production, the "hard water" is always chemically removed or reduced to soften the calcium carbonate before use.

The following with the stupid god cover complex is the most acidic ().

a.Emodin.

b.Rhein acid.

c.Aloe emodin.

d.Chrysophanol.

Correct answer: B

Answer]: Ac, D are not acidic, and the electron-absorbing ability of methyl groups is stronger than that of hydrogen atoms, so formic acid is more acidic than acetic acid.

Answer]: B glycine is deficient in amino group, and the amino group is alkaline and acidic; Compared with propionic acid, acrylic acid and lactic acid, acrylic acid has a conjugation effect, and the electrons on the carboxyl group are more likely to be biased towards the alkenyl type local double bond, which is easier to ionize and give up protons, and the acidity is enhanced.

Among the following substances, the most acidic is () sold with reeds.

Correct Answer: D

Choice D is in the aqueous solution, water and ethanol are Wu Song neutral substances, carbonate PKA=, phenol PKA=, carbonate acidity is stronger.

From the perspective of real cavity culture, sodium hydroxide solution was added dropwise to the turbid phenol water mixture until it was clarified, and then CO2 was introduced, and the solution was turbid (C6H5ONA+H2O+CO2==C6H5OH+NaHCO3), indicating that the carbonic acid was stronger.