Acids and Bases in Chemistry

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 substances 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 acid and base in different topics given below.

Conjugate acid base pair chart in order of decreasing strength of an acid or increasing strength of base

Acid Base Theories

Acids and bases properties and definition in chemistry

Acids Bases

Acids and bases properties Acids and bases in chemistry commonly possess some opposite properties. For example, acids are chemical substances whose aqueous or water solution...
Protonic definition or Bronsted Lowry Conjugate acid base pair in Chemistry

Conjugate Acid Base pair

Conjugate acid base pair definition Conjugate acid base pair or protonic definition of acids and bases independently proposed by Bronsted and Lowery in 1923 for...
Definition and Chemical Properties of Lewis Acids Base Reaction

Lewis Acids Bases

Lewis acid and base definition Lewis acid base concept or theory of acids and bases in 1923 explains the acid base properties in terms of...
Definitions, Examples and Chemical Properties of Hard, Soft and Borderline Acids

Hard Soft Acid Base

Hard soft acid base theory Hard soft acid base theory or HSAB-principle proposed by Ralph Pearson (1963) are very helpful for predicting the stability and...
pH and pOH Scale chart and definition for acidic, neutral and basic solution in chemistry

pH Scale

What is pH and pOH? pH and pOH scale define and measure the acidity and basicity of neutral, acidic, and basic solutions in water based...
Acid and bases quiz questions answers

Acids and Bases Questions

Acids and bases multiple choice questions and answers Acids and bases multiple choice questions and answers or quiz in online learning chemistry contain 10 questions for...


Calculate oxidation number or state of periodic table chemical elements

Oxidation Number

Oxidation Number of Periodic Table Elements Oxidation number or state of periodic table elements in a chemical compound or molecule is the formal charges (positive...

Acid Base Examples