Difference between strong acid and weak acid.

By BYJU'S Exam Prep

Updated on: September 25th, 2023

Strong acids ionize fully whereas weak acids ionize partially. Strong acids lose H+ if dissolved in water and losses less H+ in weak acids. Strong acids have high conductivity because of the presence of unpaired atoms whereas weak acids, it has low conductivity.

Strong Acid

Weak Acid

In an aqueous solution, strong acids fully ionise.

In an aqueous solution, weak acids can partially ionise.

Whenever it is dissolved in water, it always loses H+.

If it is dissolved in water, it loses less H+.

Due to the existence of unpaired atoms, it has a high conductivity.

It has a low conductivity as a result of the lack of unpaired atoms.

A higher degree of dissociation value.

A lower degree of dissociation value.

There are ionic bonds in it.

Covalent bonds are present in it.

Examples: HCl, H2SO4, etc.

Example: CH3COOH, H3PO4, etc.

Properties of Acids

  • Acids have a tendency to corrode.
  • They are effective electrical conductors.
  • Their pH levels are never greater than 7.
  • These chemicals react with metals to form hydrogen gas.
  • Acids have a sour flavor.
  • Examples: Sulfuric acid [H2SO4], Hydrochloric acid [HCl], and Acetic acid [CH3COOH].

Uses of Acids

  • Acetic acid is diluted into vinegar, which is used in many household processes. Its main application for it is as a food preservative.
  • Lemon juice and orange juice both include citric acid as primary ingredients. Additionally, it can be used to preserve food.
  • Acid sulphate is frequently used in batteries. This acid is frequently found in the batteries used to start car engines.
  • Sulfuric acid and nitric acid are used in the industrial manufacturing of fertilisers, paints, dyes, and explosives.
  • A significant component of many soft drinks is phosphoric acid.


Difference between strong acid and weak acid.

While weak acids only partially ionise, strong acids do so completely. When dissolved in water, weak acids lose less H+ than strong acids do. Because unpaired atoms are present in strong acids, they have higher conductivity than weak acids, which have lower conductivity.

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