Is it that the solution of the salt produced by the reaction of a strong base with a weak acid is al

In order to understand the acidity and alkalinity of the strong alkali and weak salt solution, the acid-base proton theory is used for theoretical analysis, and the pH value of the salt solution is verified by using a pH meter. The results showed that when the concentration of strong alkali and weak salt solution was c=, the positive salt solution generated by the monobasic strong base and the monobasic weak acid were alkaline. Among the acid salts produced by monobasic strong bases and multiple weak acids, the strong alkali and weak acid acid salt solution that favored proton (H) was acidic, and the strong alkali and weak acid acid salt solution that favored proton (H) was alkaline. The positive saline solution produced by monobasic strong alkali and multiple weak acids is alkaline.

Not necessarily. It depends on the volume ratio of the two liquids. If the volume of the two liquids is the same.

Then the solution becomes alkaline. If there are many weak acids and few strong bases. Then the acid and base are neutralized, and the H ion cannot be neutralized.

The solution will be acidic. If the free H ions and OH ions in the two liquids are just completely neutralized. Then the solution is neutral.

That is, salt.

Taking sodium carbonate in carbonate as an example, sodium carbonate is the product of the neutralization of strong alkali sodium hydroxide and weak acid carbonic acid, which belongs to strong alkali weak salt, and the aqueous solution of sodium carbonate shows alkalinity.

Sodium hypochlorite, sodium tetraborate, sodium sulfide, sodium silicate, etc. all belong to this kind of strong alkaline weak salts, and their aqueous solutions are alkaline.

The concentration of hydroxide from strong alkali ionization is large, so it is alkaline, on the contrary, the concentration of hydrogen ions from strong acid ionization is large, so it is acidic, and weak acid is ionized from hydrogen, although the ionization degree of hydrogen is greater than that of hydroxide but not high. After the strong base and weak acid are mixed, compare the concentration of hydroxide and hydrogen in the solution after the reaction, that is, it will be acidic or alkaline, (it will eventually be affected by the amount of substance), which is the ......essence of the acid-base reactionI don't know which grade you are, you should be in the second year of junior high school, right?

It is alkaline to produce strong alkaline weak salt.

Exactly. Like what.

Sodium carbonate, the aqueous solution is alkaline, so it is named soda ash.

Similarly, salts produced by strong acids and weak bases are acidic, such as:

nh4clcuso4

If the generated is a positive salt, it is like this;

If it's not just salt, not necessarily.

Yes. The generated strong alkaline and weak salts are hydrolyzed and alkaline.

Such as Na2CO3

kf et al.

After the reaction, strong acids and weak alkali salts are generated, because there are weak alkaline ions, which are hydrolyzed.

Assuming that the weak base ion is a-, then hydrolysis:

a- +h2o = ha + oh-

The concentration of hydroxide is increased and alkaline.

There are two cases of hydrolysis of salts consisting of weak acid groups or weak base ions:

The weak acid group combines with H+ in water to form a weak acid, and the solution is alkaline, like the aqueous solution of sodium acetate:

ch3coo- +h2o ←═ch3cooh + oh-

Weak base ions are combined with OH- in water, and the solution is acidic, such as ammonium chloride aqueous solution:

nh4+ +h2o ←═nh3·h2o + h+

The weaker the acidity (or base) of the formation of weak acids (or bases), the stronger the hydrolysis tendency of weak acids (or weak base ions).

For example, sodium borate has a stronger tendency to hydrolyze than sodium acetate, and the pH of the former is greater when the solution concentration is the same.

The acidity and alkalinity of a weak acid and weak alkali salt solution depends on the strength of the weak acid group and the hydrolysis tendency of the weak base ions.

For example, the hydrolysis tendency of weak acid groups in ammonium bicarbonate is stronger than that of weak base ions, and the solution is alkaline;

The hydrolysis tendency of weak alkali ions in ammonium fluoride is strong, and the solution is acidic;

If both have the same tendency to hydrolyze, the solution is neutral, which is an individual case, such as ammonium acetate.

Compared with the hydrolysis of the corresponding strong acid and weak alkali salts or strong alkali and weak salts, the degree of hydrolysis of weak acids and weak alkali salts is larger, and the pH of the solution is closer to 7 (at room temperature).

For example, the degree of hydrolysis of mol L's Na2CO3 is, pH, and the degree of hydrolysis of (NH4)2CO3 at the same concentration is 92%, and the pH is.

Esters, polysaccharides, proteins, etc., which react with water to form simpler substances, are also hydrolyzed

ch3cooc2h5 + h2o —→ch3cooh + c2h5oh

c6h10o5)n + nh2o —→nc6h12o6

Some hydrolyzable salts are used as acids (e.g., aluminum sulfate) or bases (e.g., sodium carbonate).

Positive salts are divided into four categories:

1. Strong acids and strong alkali salts do not undergo hydrolysis, because the anions and cations ionized by them cannot destroy the ionization balance of water, so they are neutral.

Second, strong acid and weak alkali salt, we call the weak alkali part weak positive, weak cation can hold the ionization of hydroxide ions ionized from water, destroy the ionization balance of water, make the ionization of water move forward, the result is that the concentration of hydrogen ions in the solution is greater than the concentration of hydroxide ions, making the aqueous solution acidic.

3. Strong alkali and weak salt, we call the weak acid part weak yin, and the weak yin controls the hydrogen ions ionized from the water, so that the concentration of hydroxide ions in the solution is greater than the concentration of hydrogen ions, making the solution alkaline.

Fourth, weak acid and weak alkali salt, the weak acid part holds hydrogen, and the weak yang part holds hydroxide to generate two weak electrolytes, and then compare their ionization constants Ka, KB value (not the size of the degree of hydrolysis), at a temperature, the ionization constant of the weak electrolyte (also called the ionization equilibrium constant) is a fixed value, this comparison can be derived from what the salt is, who is strong and who, and the ionization constant is based on 10.

Hello, I'm glad to be able to ask you about your question, according to the situation you described, the main reason why it is wrong in the current situation is that the salt generated by strong acid and weak alkali will be hydrolyzed in the solution to present acidic metal ions combined with hydroxide ions ionized by water, and the number of hydroxide ions is reduced, which promotes the ionization of water, so the number of hydrogen ions is greater than that of hydroxide ions, which is acidic.

For example, acidic salt solutions such as NaHSO3 and NAH2PO4 are acidic in aqueous solutions.

Example. Hello, for example, NaHSO3, NAH2PO4 and other acid salt solutions are acidic in aqueous solutions.

Oh, if calcium chloride solution is acidic, how to inhibit the deliquescent of calcium chloride products, high temperature or mixed with other substances. Inhibition of deliquescent?

Hello, at present, 1, when the amount is small: a small amount of calcium chloride, such as magnesium chloride for laboratory use, we try to store it in a dry bottle, and the frosted lid can well block its contact with the outside air to prevent deliquescent. 2. When the amount is large:

A large amount of calcium chloride can be placed in a more ventilated and dry plant to avoid deliquescent caused by high air humidity and environmental moisture. 3. Sealed storage: try to store calcium chloride as sealed as possible to reduce contact with external moisture.

Oh, I didn't make it clear, the actual expression is a product mixed with calcium chloride and minerals, and due to the failure of deliquescent, I want to find a solution.

Hello, do you have no seal in the process of deliquescent?

Well, the product is stored in the open.

Do you want to ask the reason for the failure of deliquescent?

Know the cause of deliquescent and seek solutions to deliquescent, such as: how to convert calcium chloride into calcium oxide?

Hello, in general, if calcium chloride wants to be converted into calcium oxide, it first needs to be converted into calcium carbonate, and then calcium carbonate is heated and decomposed to obtain calcium oxide. 1.Calcium chloride and sodium carbonate react to obtain calcium carbonate precipitate.

na2co3+cacl2=caco3+2nacl2.Filtered, dried, calcium carbonate obtained. Third, calcium carbonate is heated to obtain calcium oxide.

caco3=cao+co2

Oh, and how much is the heating temperature? Thank you.

Hello, under normal circumstances, the heating temperature should be proportional to your measurement, different doses, its temperature is also different, so I can't tell you an exact temperature here, I hope you can understand.

The aqueous solution of strong acids and alkaline salts must be neutral This sentence is false.

The identification of and alkali is generally used with acid-base indicators, and acids and bases will have different color development phenomena in acid-base indicators. For example, in litmus, acids will appear red and bases will appear blue. In phenolphthalein, the acid is not colored, and the base is red.

The cations ionized by acids in aqueous solution are all compounds of hydrogen ions. The so-called strong acid and weak acid are relative. The anions ionized by alkali in aqueous solution are all compounds of hydroxide ions.

The so-called strong alkali and weak alkali are relative.

If the alkali is dissolved in water and cannot be completely ionized, it is a weak base. Such as (NH3·H2O) ammonia monohydrate, Al(OH)3 aluminum hydroxide, ZN(OH)2 zinc hydroxide, etc. The explanation of strong alkali is similar to that of strong acid, that is, it is completely ionized in the aqueous solution, and the ionized negative ions have and only oh-.

First aid care for strong acid and alkali poisoning:

Strong acidosis and its manifestationsAcute strong acidosis refers to the entry of sulfuric acid, hydrochloric acid, nitric acid into the human body through the respiratory tract, ** or digestive tract, causing local burns and systemic poisoning. The manifestations of poisoning are as follows: acute inhalation poisoning can cause choking, chest tightness, tearing, dyspnea, cyanosis, hemoptysis foamy sputum, pulmonary edema, laryngeal spasm or small swelling, shock, coma, etc.

** and eye burn parts are grayish-white, yellowish or brownish-black, redness all around, clear boundaries, local severe pain, shock can occur in large areas; Eye burns can cause corneal opacity, perforation, and complete blindness. Entering from the digestive tract can show burns of the lips, mouth, pharynx, tongue, mouth, pharynx, retrosternum and supraabdominal area, as well as nausea and vomiting, vomit is a large amount of brown and esophageal and gastric mucosal fragments, and gastric perforation, peritonitis, laryngeal spasm or edema may also occur.

Strong acid and strong alkali salt is a salt produced by the reaction of strong acid and strong base, the solution is generally neutral, but there are exceptions, such as sodium fluoroborate and other Zhi fluoroborate, the fluoroboric acid corresponding to its DAO is a strong acid, but sodium fluoroborate because the fluoroborate part reacts with water to form hydroxyfluoroboronic acid and releases HF, so its aqueous solution pH is about 2 4, showing strong acidity.

For example: sodium chloride, sodium sulfate, potassium nitrate.

naoh+hcl=nacl+h2o

2NaOH + H2SO4 = 2H2O + Na2SO4 strong acid ions: six strong acids of chemical inorganics.

Sulfuric acid, nitric acid, hydrochloric acid (hydrochloric acid), hydroiodic acid, hydrobromic acid, perchloric acid strong alkali ions: sodium, potassium, etc.

Because the weak acid acid salt contains weak acid ions, the weak acid ions can not only ionize H+, but also hydrolyze to form OH-, so they are soluble in both acid and alkali.

Take naHCO3 as an example.

nahco3 + hcl ==nacl + h2o + co2nahco3 + naoh ==na2co3 + h2o