What is the acid-base properties
main properties are metals, their oxides and hydroxides.The acidic properties are nonmetals, their salts and acid anhydrides.There are also amphoteric elements capable exhibit both acidic and basic properties.Zinc, aluminum and chromium are some representative amphoteric elements.Alkaline and alkaline-earth metals exhibit typical basic properties as sulfur, chlorine and nitrogen acid.
Thus, the reaction of oxides with water, depending on the properties of the main cell, obtained either base or hydroxide or acid.
SO3 + H2O = H2SO4 - a manifestation of the acidic properties;
CaO + H2O = Ca (OH) 2 - a manifestation of the basic properties;
Periodic table, as an indicator of acid-base properties
Periodic Table can help determine the acid-base properties of the eleme
nts.If you look at the periodic table, we can see a pattern that horizontally from left to right are enhanced metallic or acidic properties.Accordingly, the closer to the left are metals, amphoteric elements, the keeper and the right nonmetals.If we look at the electrons and their attraction to the nucleus, it is noticeable that the left side of the elements have a weak charge of the nucleus and the electrons are in s-level.As a result of such elements is easier to give an electron, rather than elements in the right-hand side.Non-metals have a high enough nuclear charge.Thus, complicated the return of free electrons.Thus the elements easier to annex the electrons, showing acidic properties.
three theories for determination of properties
There are three approaches that define what properties has a connection: proton theory Bronsted-Lowry, Lewis aprotic electron theory, the theory of Arrhenius.
According to the theory of proton acidic properties are compounds capable of giving their protons.Such compounds have been named donors.A main properties are the ability to accept or attach a proton.
aprotic approach implies that the Acceptance and the donation of protons to determine the acid-base properties is optional.The acidic properties of this theory appear to accept the possibility of an electron pair, and the main, on the contrary, give this pair.
Arrhenius theory is the most relevant for the determination of acid-base properties.The study demonstrated that acidic properties exhibited when the aqueous solution in the dissociation chemical compound is separated into hydrogen ions and anions and the basic properties - cations and hydroxide ions.