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Monobasic Acid

Quick Reference
Also Known AsMonoprotic acid, monobasic acid, monobasic, single-proton acid

What is Monobasic Acid?

An acid that has only one replaceable hydrogen atom per molecule. It reacts with bases in a 1:1 molar ratio. Examples include hydrochloric acid (HCl) and nitric acid (HNO₃). Equivalent to monoprotic acid in Brønsted-Lowry terminology.

Properties & Characteristics

A monobasic acid (monoprotic acid) is an acid that can donate exactly one proton (H⁺) per molecule to a base in an acid-base reaction. Examples: hydrochloric acid (HCl), nitric acid (HNO₃), acetic acid (CH₃COOH). Monobasic acids have a single ionisation equilibrium: HA ⇌ H⁺ + A⁻ with Ka. They form only one set of salts. Contrast with dibasic (H₂SO₄) and tribasic (H₃PO₄) acids, which have multiple ionisation steps.

Uses & Applications

Monobasic acids are used extensively in: laboratory acid-base chemistry (HCl for standardisation and reaction, HNO₃ for metal dissolution, CH₃COOH in buffer solutions), industrial processes, food acidulants (acetic acid in vinegar), and pharmaceutical formulations.

Safety Information

Strong monobasic acids (HCl, HNO₃) are corrosive at all concentrations; dilute solutions still cause skin/eye irritation. Concentrated HNO₃ is both corrosive and oxidising — reaction with organic materials can be explosive. Always use appropriate acid-resistant PPE when handling mineral acids.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Monobasic Acid
Synonyms Monoprotic acid, monobasic acid, monobasic, single-proton acid

Frequently Asked Questions

An acid that has only one replaceable hydrogen atom per molecule. It reacts with bases in a 1:1 molar ratio. Examples include hydrochloric acid (HCl) and nitric acid (HNO₃). Equivalent to monoprotic acid in Brønsted-Lowry terminology.

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