What are acids?

Acids are hydrogen containing substances that give H+ ions in water solution.

  • They have a sour taste and change the color of the indicators (red litmus paper to blue).
  • It reacts with metals like iron, zinc, and aluminum to liberate hydrogen.
  • It reacts with certain bases to form salts.

Hydrochloric, sulfuric, and nitric acid is the most common examples of inorganic mineral acid used widely in the laboratory and industry.

Modern acid and base theories are not only limited to aqueous solutions (Arrhenius theory). The electronic concept (Bronsted Lowry and Lewis theory) is also used to define all the acids and bases in chemistry or chemical science.

In this category, we discuss the definition and properties of acids and bases by different concepts or theories.

Acid base titration process in chemistry

Acid Base Titration

What is Acid Base Titration? Acid base titration in chemistry is an experimental procedure used to calculate the unknown concentration of an acid or base...
Hydrochloric acid or muriatic acid or aqueous solution of hydrogen chloride gas chemical formula HCl and structure with properties and uses

Hydrochloric Acid

What is Hydrochloric Acid? Hydrochloric acid or muriatic acid is an aqueous solution of hydrogen chloride gas with the chemical formula HCl. It was historically...
Buffer solution definition, uses, pH, and types of acid and alkali buffers solutions in chemistry and biolog


What is a Buffer Solution in Chemistry? Buffer solution or simply called buffer in analytical chemistry or biology is a solution whose pH remains virtually...
Nitric acid (chemical formula HNO3) and nitrate ion structure, uses, and production process

Nitric Acid

What is Nitric Acid? Nitric acid (chemical formula HNO3) is colorless, fuming, highly corrosive liquid. It is the most important heavy chemical used in the...
Boric acid (H3BO3) Structure, Properties, Preparation, and Chemical uses

Boric Acid

What is Boric Acid? Boric acid or Boric Powder, also called hydrogen borate or orthoboric acid is a white crystalline solid with the chemical formula...
Sulfuric acid (H2SO4) and sulfate ion structure. production, properties and uses

Sulfuric Acid

Sulfuric acid chemical formula Sulfuric acid or sulphuric acid or hydrogen sulfate (chemical formula H2SO4) is a commercially important dense, colorless, oily, corrosive liquid. It...
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 was proposed by Ralph Pearson in 1963. It is very helpful for predicting...
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...
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...
Definition and Chemical Properties of Lewis Acids Base Reaction

Lewis Acids Bases

Lewis acid and base definition Lewis acid base concept or theory explains the acids and bases properties in terms of electronic structure with the formation of...