Difference Between strong and Weak acid

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Acids are chemical substances that donate hydrogen ions or proton when blended in solutions. The variety of protons given off through a specific acid in reality determines the stamin of the mountain – whether it is a strong acid or a weak acid. In bespeak to know the toughness of the acids, one need to compare their tendency to donate proton to the similar base (mostly water). The stamin is denoted by a number dubbed pKA.

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What is a solid acid?

An mountain is claimed to be solid if the dissociates or ionizes fully in a solution. The means, that is may be to offer the largest number of H+ ions or proton when combined in a solution. These ions space the charged particles. Due to the fact that a strong acid donates a greater variety of ions together it breaks down, or ionizes, that means a strong acid is a conductor that electricity.

When an mountain mixes in H2O, a proton (H+ ion) is brought to a H2O molecule to generate a H3O+ (Hydroxonium ion) and also a – ion based on which acid is associated to begin with.

In a basic scenario,

Such chemistry reactions have the right to be revered, however in few cases, the acid is gives away H+ ion rather easily and the reaction looks choose being one-way. And the mountain is complete dissociated.

For e.g., once hydrogen chloride disappear in H2O to do HCl, so tiny of the reverse reaction happens that we have the right to write:

At one time, hundreds percent digital reaction will take location wherein hydrogen chloride will show reaction with H3O+ (Hydroxonium ion) and also Cl– ions. Here, the solid acid is Hydrogen Chloride.


What is a Weak acid?

An acid is claimed to it is in weak if that ionizes partially or incompletely, providing off just some that its hydrogen atoms right into the solution. Hence, the is less qualified as contrasted to a strong acid in giving off protons. Weak acids have higher pKa than strong acids.

Ethanoic mountain is a an excellent example of a weak acid. It reflects reaction with H2O for developing H3O+ (Hydroxonium ions) and also CH3COOH (ethanoate ions), however the turning back reaction shows much more success 보다 the forward one. The molecules reaction quite conveniently to ameliorate the acid and also the H2O.

At any one time, only about one percent the the CH3COOH mountain molecules show conversion right into ions. Everything is left is the an easy acetic acid (systematically dubbed ethanoic acid) molecules.

Difference between strong acid and Weak acid


Strong acid

A solid acid is an acid that ionizes completely in one aqueous solution. A strong acid will always loosened a proton (A H+) when dissolved in H2O. In various other words, a solid acid is always on its toes and also quite effective in providing off protons.

Weak acid

A weak acid is one the ionizes partly in a solution. It gives off only few of its hydrogen atoms in come the solution. Thus it is less capable than a strong acid.

Electrical conductivity

Strong acid

Strong acids will always show solid conductivity. Strong acids typically pass more current as contrasted to the weak acids for the exact same voltage and also concentration.

Weak acid

Weak acids have a low conductivity. Castle are negative conductors and also show a low worth for current passing

Rate of reaction

Strong acid

Rate the reaction is quicker in the strong acids

Weak acid

Rate the reaction is slow in weak acids


Strong acid

Hydrochloric mountain (HCl), Nitric mountain (HNO3), Perchloric acid (HClO4), Sulfuric mountain (H2SO4), Hydroiodic acid (HI), Hydrobromic mountain (HBr), Chloric mountain (HClO3).

Weak acid

Sulfurous mountain (H2SO3), Acetic mountain (CH3COOH), Phosphoric mountain (H3PO4), Benzoic mountain (C6H5COOH), Hydrofluoric acid (HF), Formic mountain (HCOOH), Nitrous acid (HNO2).


Strong acid

In a strong acid, the pH is reduced than, usually 3. Strong acids possess a very high concentration that H+ ions (an acid having a pH of 3 has 0.001 moles per liter the Hydrogen ions).

Weak acid

A weak acid has a pH ranging in between 3-7.

Value of pKa

Strong acid

In a strong acid, the worth of pKa is quite low.

Weak acid

In a weak acid, the value of pKa is rather high.

See more: What Is The Molarity Of 3% Hydrogen Peroxide, What Is The Molarity Of 3% H2O2


Strong acid

HCl(g) + H2O(l) ≈ H3O+(aq) + Cl−(aq)

Weak acid

CH3COOH(l) + H2O(l) ≈ H3O+(aq) + CH3COO−(aq)

Summary of strong acid Vs. Weak acid

The clues of distinction between solid and Weak Acids have been summary below: compare chart


Dr Amita Fotedar is an experienced study Consultant with a demonstrated background of functioning in elite study Institutes favor United Nations breakthrough Programme, Istanbul, Turkey, Indian academy of Science, Bangalore, India and also International Water administration Institute, Colombo, Srilanka. Skilled in biological Sciences, environmental Health, organic Resources, Water source Management, and Renewable Energy, she has a doctor in ecological Sciences native the university of Jammu, India. Apart from she PhD, she has actually a post Graduate Diploma in global Studies from international Pacific University, new Zealand Campus, and also has additionally been rewarded a certification in Climate studies from Harvard college (EdX). She is a receiver of scholastic Excellence compensation from worldwide Pacific University, new Zealand campus. At present she is follow MicroMasters in Sustainable energy from The college of Queensland, Australia. She is a Co- founder and Research Advisor for a brand-new Zealand based Sustainability and Environmental solutions Entity and also is also a member that the environmental Peacebuilding association at SDG Academy, giving mentorship (a cooperation network of academic and research organizations under the auspices of UN Secretary-General). She has approximately 35 national and also international publications to she credit.