Acetate carbonate silicic acid is relatively acidic, what is the acidity of acetic acid and carbonic

Silicic acid is produced by the introduction of carbon dioxide into sodium silicate, so carbonic acid is greater than that of silicic acid.

Sodium acetate can react with sodium carbonate to release gas, so acetic acid is more acidic than carbonic acid.

So acidic carbonic acid >> acetic acid >> silicic acid.

Acidity: Acetic acid is greater than carbonic acid and greater than silicic acid.

Acidic carbonic acid, acetic acid, silicic acid.

Experimental setup: The Erlenmeyer flask contains a solid reagent, which is the positive salt of one of the three acids, and is topped by a separating funnel with a liquid reagent in the funnel. The Erlenmeyer flask is attached to a corked bottle containing a liquid reagent.

The flask is in turn connected to a beaker from which a catheter leads to the beaker, which also contains a liquid reagent. No other acidic reagents are required. Q: What is the liquid in the separating funnel of the solid in the Erlenmeyer flask, and what is the function of the reagent in the second bottle?

What is the phenomenon in the third (beaker)? The separating funnel is filled with acetic acid, and carbonates (e.g., calcium carbonate) are placed in Erlenmeyer flasks, and the resulting gas is passed into the sodium silicate. Phenomenon:

There are air bubbles in the Erlenmeyer flask, and white precipitates in the beaker. The reagent bottle removes excess acetic acid.

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You can tell by the table of elements.

Like vinegar, the table of elements weakens from top to bottom. Alkaline on the contrary.

The acidity of acetic acid and carbonic acid is: acetic acid is more acidic. Acidity is often expressed by the PKA of the standard solution of the acid (I = 0, temperature 25 degrees Celsius, 1 standard pressure, C = mol L), that is, the acidity constant.

In weak acids, the dissociation constant of the acid should be judged. (The lower the number, the more acidic).

At room temperature, the pH value of the solution is acidic when it is below 7. The lower the pH, the more acidic it is. Acids can neutralize with alkalis to form salts and water, as well as acid-base indicators that can change color, react with active metals to form hydrogen, and metathesis with certain salts to form new acids and salts, which are called acidity.

Acidity of acetic acid:

The carboxyl hydrogen atom of acetic acid can be partially ionized into hydrogen ions (protons) and released, resulting in the acidity of carboxylic acid. Acetic acid is a single weak acid in aqueous solution, the acidity coefficient is, pka=, and the pH of the acetic acid solution with a concentration of 1mol L (similar to the concentration of household vinegar) is, that is, only the acetic acid molecule is dissociated.

The above content reference: Encyclopedia - Acidic.

Acetic acid is highly acidic.

In terms of chemical structure, both are different groups on the carbonyl group, the carbonyl group connected by carbonic acid is connected to two hydroxyl groups, and the acetic acid is connected to the methyl group and the hydroxyl group, and the methyl group is electron-rich, so the dissociation of hydrogen ions is weaker than that of carbonic acid, so the acidity of acetic acid is not as strong as that of carbonic acid.

However, carbonic acid is unstable compared to acetic acid, and it is easy to produce CO2 and H2O, and the amount of carbonic acid in water is very, very small. Therefore, it shows that the acidity is relatively weak, and if the degree of ionization is considered, the acidity of carbonic acid is stronger than that of acetic acid.

A method for judging the acidity and alkalinity of a substance

Method 1: The acidity and alkalinity of salts depends on the metallicity of cations. Metallic, that is, alkaline. For example, the salt formed by sodium, potassium, calcium, and weak acids is alkaline. If the metallic is weak, it is acidic.

Method 2: It is to look at the hydrolysis strength of anion and ion, if the cation is easy to hydrolyze, the substance is acidic, if the cation is not easy to hydrolyze, the substance is alkaline.

The above content reference: Encyclopedia - Acidic.

Acetic acid is stronger than carbonic acid, adding acetic acid to sodium carbonate, carbon dioxide is produced, according to the principle of strong acid to make weak acid, acetic acid is stronger than carbonic acid.

The crystal structure of acetic acid (acetic acid) shows that the molecules are bound into dimers (also known as dibinders) by hydrogen bonds, and the dimers are also present in the vapor state of 120. Dimers have high stability, and have been proven by freezing point reduction molecular weight determination and X-ray diffraction of carboxylic acids with small molecular weights such as formic acid and acetic acid in solid and liquid states.

Even the gaseous state exists in the form of a dimer. When acetic acid is dissolved in water, the hydrogen bonds between the dimers will be broken very quickly. Other carboxylic acids have a similar dimerization phenomenon.

Acetic acid can undergo the typical chemical reaction of ordinary carboxylic acids, and at the same time, it can be reduced to form ethanol, acetyl chloride can be generated through nucleophilic substitution mechanism, and acid anhydride can also be generated by bimolecular dehydration.

Contrast and distinguish the difference

Acetic acid is also known as acetic acid or glacial acetic acid, which belongs to organic monoacid, it is also the main component of vinegar, in terms of physical properties, it is a colorless liquid, with a pungent acetic acid taste in taste, and in terms of solubility, it can be soluble in organic solvents such as water, carbon tetrachloride, ethanol. Carbonic acid is a binary weak acid with a small ionization constant.

Acetic acid is more acidic than carbonic acid. H2CO3 is the chemical formula of carbonic acid, and CH3COOH is the chemical formula of acetic acid, judging acidity from the ionization constant, because the ionization constant of carbonic acid is not as large as the ionization constant of acetic acid, so acetic acid will be stronger in terms of acidity.

It can also be seen from the perspective of the reaction between acetic acid and carbonate, after the reaction, carbonic acid is generated, and carbon dioxide and water are decomposed, which is consistent with the principle of strong acid to weak acid, so acetic acid is highly acidic.