Strong acid, strong base, weak acid, what are the weak bases

Remember, only hydrochloric acid, sulfuric acid, nitric acid, hydroiodic acid, and hydrobromic acid are strong acids, only sodium hydroxide, barium hydroxide, calcium hydroxide, and potassium hydroxide are strong bases, and the rest are considered weak acids when the topic is not indicated.

Salt is not strong or weak.

Strong acid and weak alkali salt is the salt formed by the reaction of strong acid and weak base, and the dissolved water is acidic, such as ferric chloride, (there will be a hydrolysis reaction);

Strong alkali weak salt is a salt that reacts with strong alkali and weak acid, and the dissolved water is alkaline, such as sodium carbonate;

Multiple weak acid salts are salts with weak acids containing more than two hydrogen, multiple strong alkali salts are salts with weak alkali containing more than two hydroxide species, weak acid ions: carbonate ions, sulfite ions, hydrosulfate ions (HS, S), silicate, metaaluminate, acetate,;

Strong acid ions: sulfate, chloride ions, nitrate, perchlorate, strong base ions: NA, K, CA, BA, weak base ions: Al, Fe, NH4, Cu, just read the solubility table at the back of the book.

In the case of high school, strong acids (HCl, H2SO4, HNO3, Hi, HCO4, HBRs), strong bases (compositions below the first main group Na and below the second main group CA), such as Naoh, Koh, Ca(OH)2, Ba(OH)2

Weak acids (including HCO-, CO32-, HS-, S2-, SO32-, HSO32-, SO32-, CLO-, CH3COO-, CN-, PO43-).

Weak alkali (except for ammonia, it is basically difficult to tolerate alkali.) For example, Cu(OH)2, Fe(OH)3, NH3·H2O

Generally, remember that the common strong acids and strong bases are basically weak acids and weak bases.

Strong acids, sulfuric acid, hydrochloric acid, phosphate, nitric acid.

Strong alkali, sodium hydroxide, potassium hydroxide, calcium hydroxide.

Weak acid H2CO3, HF, CH3Cooh, H2S, HCl, Hno2 weak base Ammonia monohydrate, note that ammonia is not a weak base, it is a mixture), mg(OH)2, Fe(OH)2, Fe(OH)3, Cu(OH)2

Strong acids include sulfuric acid, hydrochloric acid, weak acids include nitric acid, strong bases have sodium hydroxide, and weak bases have iron hydroxide.

In middle school, you don't need to memorize a lot. You make a special note of strong acids and alkalis, and the rest are basically weak acids and weak alkalis.

Strong acids have HCl

h2so4hno3hihbr

Strong bases have Ba(OH)2

naohca(oh)2koh

In general, organic acids are weak acids. Such as ch3coohIn the inorganic acids, except for HCL, HBR, and HI, all others are weak acids.

Weak bases, most of the bases that are insoluble in water are weak bases. Such as mg(OH)2

In inorganic acids, the higher the valency of the central atom, the stronger its alkalinity. For example, HCO4 is the most acidic inorganic acid.

Strong alkali, the more metallic the metal, the more alkaline it is. For example, CSOH is the most alkaline base.

Common weak acids: H2CO3 (carbonic acid), HF (hydrofluoric acid, less common), CH3COOH (also known as C2H4O2 acetic acid, also known as acetic acid), H2S (hydrosulfuric acid), HClo (hypochlorous acid), HNO2 (nitrous acid, less common), all organic acids within the middle school range (middle schools do not learn organic strong acids), H2SO3 is also a weak acid Common medium and strong acids: phosphoric acid, oxalic acid, formic acid Common strong acids:

Sulfuric acid H2SO4, HCl hydrochloride, HNO3 nitrate, HBR hydrobromide, HI hydroiodic acid, HCO4 perchloric acid HCO4 Common weak bases: Mg(OH)2, Al(OH)3, Zn(OH)2, Fe(OH)3, Fe(OH)2, Cu(OH)2, only soluble in water. Common strong bases:

koh naoh ba(oh)2 ca(oh)2

Categories: Education Academic Exams >> Gaokao.

Problem description: Please give a more detailed answer!

Analysis: The cations ionized by acid --- in aqueous solution are all compounds of hydrogen ions. The so-called strong acid and weak acid are relatively ,-- acids that can be completely ionized when dissolved in water, and belong to strong acids. Such as HCl, H2SO4, HNO3, HBR, Hi,

- If the acid is dissolved in water and cannot be completely ionized, it is a weak acid. Such as carbonic acid, H2S, HCN, HF, phosphoric acid, formic acid, acetic acid, etc.

The anions ionized by alkali --- in aqueous solution are all compounds of hydroxide ions. The so-called strong base and weak base are relatively speaking,-- alkali can be completely ionized when dissolved in water, and they belong to strong bases. For example, KOH, NaOH, BA(OH)2, CSOH、-- and the corresponding alkali corresponding to the active metal are generally strong alkalis.

- If the alkali is dissolved in water and cannot be completely ionized, it is a weak alkali. Such as monohydrate and ammonia, calcium hydroxide (medium and strong alkali), aluminum hydroxide, zinc hydroxide, etc.

Just pay attention to the summary!

The acid that can be completely ionized is a strong acid, and the base that can be completely ionized is called a strong base, for example, sulfuric acid can be completely ionized in water. In one step, there are two hydrogen ions in carbonic acid, which cannot be ionized into two hydrogen ions in one step, and the reaction is reversible, and alkaline is similar to acidity.

Strong: Strong electrolyte, can be completely ionized.

Weak: weak electrolyte, partially ionized.

Extended information: strong bases: Ba(OH)2, KOH, NaOH, Ca(OH)2, bases other than these four bases are weak bases.

Strong acids: HCl, H2SO4, HNO3, HCO4, HIO3, Hi, HBR, in addition to these strong acids, there are not many other strong acids. The pH of strong acids is mostly between 0 1, while the pH of weak acids is generally >> = 2

Hope, thank you! Yours is the greatest support to me.

But how to distinguish between weak acid, strong alkali, and weak alkali should be memorized by memorizing some things, and this should be known only by being able to know, because you can't tell what he is just from his appearance.

The eight strong acids are: sulfuric acid, nitric acid, hydrochloric acid, perchloric acid, permanganic acid, hydroiodic acid, hydrobromic acid, hydrochloric acid; The four strong bases are: sodium hydroxide, potassium hydroxide, calcium hydroxide, and barium hydroxide.

The so-called strong base and weak base are relatively speaking,-- alkali can be completely ionized when dissolved in water, and they belong to strong bases. The alkali metal and some alkaline earth metals correspond to a strong alkali metal.

Conventional alkali refers to the ionization of hydroxide in aqueous solution, and most of the ionization is generally regarded as a strong base (unlike acid, many polyalkalis are difficult to directly see whether they are strong alkalis with PKB value), so calcium hydroxide is not strictly regarded as a strong base, because there are a large number of CaOH ions in saturated calcium hydroxide solution.

A broader concept of a base refers to a substance that donates electrons, or a substance that accepts protons.

The alkalinity comes from the acid-base proton theory, and a strong alkali is the one with a strong ability to accept protons.

Strong alkalis are divided into organic strong bases and inorganic strong bases.

Among the inorganic strong bases, amino compounds (such as potassium amino, sodium amino, etc.), some silicides (such as PK greater than 150 of Mg Si) and alkali metal hydrides (Nah, Kh, etc.) are the most alkaline, and then the above hydroxides.

Strong acids, sulfuric acid, hydrochloric acid, phosphate, nitric acid.

Strong alkali, sodium hydroxide, potassium hydroxide, calcium hydroxide.

Weak acid H2CO3, HF, CH3Cooh, H2S, HCl, Hno2 weak base Ammonia monohydrate, note that ammonia is not a weak base, it is a mixture), mg(OH)2, Fe(OH)2, Fe(OH)3, Cu(OH)2