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.
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.
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.
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.
Editorial standards: Chemical data is sourced from peer-reviewed literature,
CAS Registry, NIST WebBook, and PubChem. Safety information reflects guidance from OSHA, ECHA,
and IAEA. For educational purposes only — always consult official SDS documentation and qualified
professionals before handling chemicals.
