List of Weak Acids

Weak Acids are the acids that do not completely dissociate into their constituent ions when dissolved in solutions. The pH of Weak acid is about in the range of 3-5. The value of Acid dissociation constant of weak acid is low. Weak acids does not release all H⁺ which are present. The weak acid include Hydrofluoric acid, Nitrous acid, Acetic acid, Sulfurous acid and Phosphoric acid.

Hydrofluoric Acid (HF)

• It is a colorless Weak acid.
• The chemical formula of Hydrofluoric acid is HF.
• The boiling point of HF is 63 deg C.
• This acid is also widely used in the preparation of many useful fluorine compounds.
• It is an inorganic acid which is colorless and highly corrosive capable of dissolving many substances and compounds like oxides.
• The physical properties of the HF, like its density, melting point and boiling point varies because it is dependent on the concentration of HF in the aqueous solution.

Nitrous Acid (HNO₂)

• It is pale blue color Weak acid.
• The chemical formula of Nitrous acid is HNO₂ .
• It has pungent smell. The boiling point of HNO₂ is 158 deg C.
• Nitrous acid is a mixture of nitric acid and nitrous gas but with a smaller proportion of oxygen than what exists in nitric acid.
• Nitrous acid was discovered by Scheele.
• It is obtained by distilling perfectly dry nitrate of lead in a retort, fitted with a receiver.

Acetic Acid (CH₃COOH)

• It a weakly acidic compound commonly known as vinegar.
• The formula of Acetic acid is CH₃COOH.
• It has a pungent smell and sour in taste.
• These are added in pickels for increasing taste of it and it also act as preservatives.
• The boiling point of Acetic acid is 118 deg C.
• It is a carboxylic acid consisting of a methyl group that is attached to a carboxyl functional group.
• The systematic IUPAC name of acetic acid is ethanoic acid.

Sulfurous Acid (H₂SO₃)

• It is a colorless weak acid.
• Sulfurous acid is also referred to as Sulfur dioxide solution or trioxosulfuric acid or di-hydrogen trioxosulfate.
• It is an intermediate species that forms acid rain from sulfur dioxide (which is SO₂).
• There is no evidence that sulfurous acid exists in the solution, but this molecule has been detected in the gaseous phase.
• This compound is used as a reducing agent. Sulfurous acid can be used as an intermediate in industries.

Strong Acid is an acid that completely dissociates in an aqueous solution, while Weak Acid is an acid that partially dissociates in aqueous solution. Examples of strong acids are Hydrochloric acid (HCl), Sulfuric acid (H₂SO₄), Nitric acid (HNO₃), Chloric acid (HClO3), Hydrobromic acid (HBr), Hydroiodic acid (HI), and examples of weak acids are Hydrofluoric acid (HF), Nitrous acid (HNO₂), Sulfurous acid (H₂SO₃), Phosphoric acid (H₃PO₄), etc.

In this article, we are going to discuss what strong acid is, the list of strong acids, what weak acid is, and the list of weak acids.