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Monoprotic Acid vs. Diprotic Acid — What's the Difference?

Edited by Tayyaba Rehman — By Fiza Rafique — Published on December 4, 2023
Monoprotic Acid can donate one proton (H⁺) per molecule, while Diprotic Acid can donate two protons (H⁺) per molecule.
Monoprotic Acid vs. Diprotic Acid — What's the Difference?

Difference Between Monoprotic Acid and Diprotic Acid

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Key Differences

Monoprotic Acid is an acid that releases only one proton (H⁺) when it dissociates in a solution. On the other hand, Diprotic Acid can release two protons (H⁺) sequentially during its dissociation.
Fiza Rafique
Dec 04, 2023
While Monoprotic Acid examples include hydrochloric acid (HCl), where one molecule gives one proton, Diprotic Acid examples like sulfuric acid (H₂SO₄) can provide two protons.
Fiza Rafique
Dec 04, 2023
Both Monoprotic Acid and Diprotic Acid can impact the pH of a solution, but the extent and rate of pH change might differ due to the number of protons donated.
Fiza Rafique
Dec 04, 2023
Titration studies with Monoprotic Acid show one equivalence point, representing the moment when all of its protons have been neutralized. In contrast, a Diprotic Acid exhibits two equivalence points, corresponding to the neutralization of its two protons.
Fiza Rafique
Dec 04, 2023
In terms of acid strength, a Monoprotic Acid's strength is gauged by its dissociation constant, whereas a Diprotic Acid can have two dissociation constants – one for each proton.
Fiza Rafique
Dec 04, 2023
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Comparison Chart

Number of Protons Donated

One proton (H⁺) per molecule
Two protons (H⁺) per molecule
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Dec 04, 2023

Example

Hydrochloric acid (HCl)
Sulfuric acid (H₂SO₄)
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Dec 04, 2023

Equivalence Points

One
Two
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Dec 04, 2023

Dissociation Constants

One dissociation constant
Two dissociation constants
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Dec 04, 2023

Typical pH Effect

Changes pH based on one H⁺
Changes pH based on two H⁺s
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Dec 04, 2023

Compare with Definitions

Monoprotic Acid

Contains one dissociation constant.
The Monoprotic Acid, HNO₃, has a single Ka value.
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Oct 26, 2023

Diprotic Acid

Characterized by two dissociation constants.
The Diprotic Acid, H₂SO₄, has two Ka values corresponding to its two protons.
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Oct 26, 2023

Monoprotic Acid

Acid that donates one proton.
Hydrochloric acid (HCl) is a common Monoprotic Acid.
Fiza Rafique
Oct 26, 2023

Diprotic Acid

Acid that donates two protons.
Sulfuric acid (H₂SO₄) is a well-known Diprotic Acid.
Fiza Rafique
Oct 26, 2023

Monoprotic Acid

Reacts to neutralize one base molecule.
One molecule of a Monoprotic Acid will neutralize one molecule of a base.
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Oct 26, 2023

Diprotic Acid

Has two acidic hydrogens.
The Diprotic Acid, H₂CO₃, can release two H⁺ ions in a solution.
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Oct 26, 2023

Monoprotic Acid

Has one acidic hydrogen.
In a solution, the Monoprotic Acid, HF, releases one H⁺.
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Oct 26, 2023

Diprotic Acid

Shows two equivalence points.
During a titration, a Diprotic Acid will exhibit two pH jumps.
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Oct 26, 2023

Monoprotic Acid

Exhibits one equivalence point.
During titration, a Monoprotic Acid will have a single pH jump.
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Oct 26, 2023

Diprotic Acid

Neutralizes two base molecules.
A molecule of a Diprotic Acid will neutralize two molecules of a base.
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Oct 26, 2023

Common Curiosities

How many equivalence points does a Diprotic Acid have in a titration?

A Diprotic Acid has two equivalence points.
Fiza Rafique
Dec 04, 2023

Can a Diprotic Acid release both protons at once?

Typically, a Diprotic Acid releases its protons sequentially, not simultaneously.
Fiza Rafique
Dec 04, 2023

Can a Monoprotic Acid have two dissociation constants?

No, a Monoprotic Acid has only one dissociation constant.
Fiza Rafique
Dec 04, 2023

Are Monoprotic Acids generally weaker than Diprotic Acids?

Not necessarily; acid strength depends on factors beyond just proton count.
Fiza Rafique
Dec 04, 2023

Are all acids either Monoprotic or Diprotic?

No, acids can be monoprotic, diprotic, or even triprotic (donating three protons).
Fiza Rafique
Dec 04, 2023

How does pH change differ between a Monoprotic Acid and a Diprotic Acid?

A Diprotic Acid can cause two pH shifts due to its two protons, whereas a Monoprotic Acid causes one shift.
Fiza Rafique
Dec 04, 2023

What is the main difference between a Monoprotic Acid and a Diprotic Acid?

A Monoprotic Acid donates one proton, while a Diprotic Acid donates two.
Fiza Rafique
Dec 04, 2023

Give an example of a Monoprotic Acid.

Hydrochloric acid (HCl) is an example of a Monoprotic Acid.
Fiza Rafique
Dec 04, 2023

Does a Diprotic Acid have one or two dissociation constants?

A Diprotic Acid has two dissociation constants.
Fiza Rafique
Dec 04, 2023

Do both Monoprotic Acid and Diprotic Acid change the pH of solutions?

Yes, both affect pH, but the rate and extent can differ.
Fiza Rafique
Dec 04, 2023

Is sulfuric acid a Diprotic Acid?

Yes, sulfuric acid (H₂SO₄) is a Diprotic Acid.
Fiza Rafique
Dec 04, 2023

How does a Monoprotic Acid react with bases?

A Monoprotic Acid will neutralize one molecule of a base.
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Dec 04, 2023

Can a Diprotic Acid ever behave like a Monoprotic Acid?

Under certain conditions, a Diprotic Acid might release only one proton, acting like a Monoprotic Acid.
Fiza Rafique
Dec 04, 2023

Which acid type, Monoprotic or Diprotic, is more common?

Both types are common, but the context determines their prevalence.
Fiza Rafique
Dec 04, 2023

Can the second proton of a Diprotic Acid be harder to release than the first?

Yes, often the second proton of a Diprotic Acid is less acidic and harder to release.
Fiza Rafique
Dec 04, 2023

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Author Spotlight

Written by
Fiza Rafique
Fiza Rafique is a skilled content writer at AskDifference.com, where she meticulously refines and enhances written pieces. Drawing from her vast editorial expertise, Fiza ensures clarity, accuracy, and precision in every article. Passionate about language, she continually seeks to elevate the quality of content for readers worldwide.
Tayyaba Rehman is a distinguished writer, currently serving as a primary contributor to askdifference.com. As a researcher in semantics and etymology, Tayyaba's passion for the complexity of languages and their distinctions has found a perfect home on the platform. Tayyaba delves into the intricacies of language, distinguishing between commonly confused words and phrases, thereby providing clarity for readers worldwide.

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