What are Acids and Bases?

Acids and bases in chemistry can be defined by five different theories or concepts like the Arrhenius theory, the solvent system concept, the protonic concept, the Lewis acid base theory, and the hard soft acid base principle. According to the Arrhenius theory, an acid is any hydrogen-containing substance that gives an H+ ion in the aqueous solution whereas a base gives an OH ion in solution. The protonic concept or Bronsted-Lowry theory defines an acid as a proton donor and a base as a proton acceptor. In learning chemistry, we discuss the different theories or concepts of acids and bases in different topics given below.

Acid Base Theories

Definitions, Examples and Chemical Properties of Hard, Soft and Borderline Acids

Hard Soft Acid Base

Hard Soft Acid Base and HSAB-Principle Hard soft acid base definition and HSAB-principle proposed by Ralph Pearson (1963) are very helpful for predicting the stability...
Protonic definition or Bronsted Lowry Conjugate acid base pair in Chemistry

Conjugate Acid Base

Definition of Conjugate Acid Base Pair Conjugate acid base pair or protonic definition of acids and bases independently proposed by Bronsted and Lowery in 1923...
pH scale and pOH define acidity or basicity level chart of neutral, acidic, basic alkaline water solution by measure of hydrogen ion in chemistry or science

pH Scale

pH Scale Definition in Science pH scale define and measure the acidity and basicity of neutral, acidic, and basic pure water solutions based on the...
Definition and Chemical Properties of Lewis Acids Base Reaction

Lewis Acids Bases

Definition of Lewis Acid and Base Lewis acid base concept or theory of acid and base in 1923 explains the acids bases properties in terms...
Acidic and Basic Properties and Acid Base neutralization reaction in water solution

Acids Bases

Properties of Acids and Bases Acids bases properties and definition based on Arrhenius theory for learning chemistry suggested that acid dissociate hydrogen ion whereas base...

Acid Base Examples

Shape of water molecule, chemical formula H2O, formed by oxygen and hydrogen existing in solid (ice), liquid, gas form

Water Molecule

Water Molecule Chemical Structure Water molecule, chemical formula H2O, formed by chemical elements oxygen and hydrogen, existing in our earth environment in crystalline solids, liquid solutions,...

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