Super alkali, metal crystal or ionic compound?

= The information you checked is a bit wrong, the real definition of super strong base has not reached a consensus, and CS3N cannot be a covalent compound.

Wikipedia is quoted below:

Super alkali is a substance that is extremely alkaline. At present, there is no clear definition of super-strong bases, but most chemists use sodium hydroxide as the boundary between strong bases and super-strong bases.

Another boundary between a strong base and a super base is hydroxide ions, because hydroxide is the most alkaline substance in aqueous solution, and stronger bases will have a neutralization reaction with water in water to produce hydroxide and protonated bases. Another way to define a super-strong base is to use whether the carbonyl group can lose hydrogen and turn into enol, and ordinary bases cannot produce the above reactions. However, there is no standard chemical definition of the term super-strong base, for example, proton sponge will also be called super-strong base.

Super alkalis can be divided into three main types: organic compounds, organometallic compounds and inorganic compounds.

Most of the organometallic compounds produced by the more reactive metals are super bases, such as organolithium compounds and organomagnesium compounds (Greenia reagent). Another super-strong base is the substitution of hydrogen by a more reactive metal that connects non-carbon atoms, such as oxygen (unsaturated alkoxides) or nitrogen (e.g., lithium diisopropylamino).

The super-strong base commonly used in organic synthesis is Schlosser's base's base）。Because of the affinity between lithium and oxygen in the alcohol group, n-butyllithium and potassium tert-butoxide exchange cations become n-butyl potassium and lithium tert-butoxide, and the lithium of n-butyl lithium is replaced by potassium, which makes the ionic property of n-butyl stronger, so the overall alkalinity also increases.

Inorganic super-strong bases are generally salts, which produce ** number of small anions after dissociation. For example, lithium nitride has a high anion negative charge density, so it is easy to attract other acids, such as hydronium ions. The hydrides of the alkali gold group and the alkaline earth gold group (such as sodium hydride, calcium hydride) are also super bases.

Reactions involving super-strong bases are usually sensitive to water and need to be carried out at low temperatures in non-reactive gases. Many reactions are desirable to be performed under conditions that are not prone to nucleophilic reactions, that is, to participate in the reaction as a non-nucleophilic base. Alkyl lithium such as unhindered cannot be used with electrophiles such as carbonyl groups because alkyl lithium reacts with electrophiles as nucleophiles.

Super alkali, metal crystal or ionic compound?

Reward points: 20 - Compounds that are more than 100,000 times more alkaline than NaOH in 13 days and 22 hours before the end of the problem are called "super bases".

This type of base is generally a metal crystal, or "metal ion crystal". Most of its cations are composite cations, surrounded by a lattice framework composed of OH, which can be stretched, deformed, and compressed, but the structure will not change. The entire structure is immersed in "electronic gas".

Metallic bonds are very strong, so super-strong bases are generally clear, mercury-like liquids.

The most common modern super-strong base nowadays is "cesium-ammonium base". Caesium-ammonium base is prepared by dissolving cesium hydroxide in the covalent compound CS3N, which is 10 billion times more basic than NaOH.

Why are they ionic compounds, but metal crystals?

That's made up to deceive people.

Yes, because the degree of ionization is very large, but the weak base is mostly covalent, and there are also ionic compounds ammonia monohydrate, Al(OH)3 is a weak base, but covalent. Generally speaking, there are three strong industrial acids: HCl, HNO3, and H2SO4.

Four strong bases: NaOH, KOH, BA(OH)2, CA(OH)2. Some also say that there are three strong bases:

naoh、koh、ba(oh)2。

An ionic compound is a compound composed of cationic lead and anions.

When reactive metals (such as sodium, potassium, calcium, magnesium, etc.) and reactive nonmetals (such as fluorine, chlorine, oxygen, sulfur, etc.) are combined with each other, reactive metals lose electrons to form positively charged cations (such as Na+, K+, Ca2+, Mg2+, etc.), and reactive nonmetals are slow enough to form negatively charged anions (such as F-, Cl-, O2-, S2-, etc.), and cations and anions form ionic compounds by electrostatic action. For example, sodium chloride is an ionic compound composed of positively charged sodium ions (Na+) and negatively charged chloride ions (Cl-). In ionic compounds, the total number of positive charges carried by cations is equal to the total number of negative charges carried by anions, and the whole compound is electrically neutral.

Ionic compounds are found in:

1. Compounds formed between reactive metals (referring to the metallic elements of the first and second main groups) and active non-metallic elements (referring to the elements of the sixth and seventh main groups).

2. Compounds formed between metal elements and acid ions. (acid ions such as sulfate ion SO42-, nitrate ion NO3-, carbonate ion CO32-, etc.);

3. Between ammonium ions (NH4+) and acid ions, or between ammonium ions and non-metallic elements, such as NH4Cl and NH4NO3.

4. NaH, Kh and other active metal hydrides.