GlossariesGCSE GlossariesGCSE Chemistry GlossaryCarbonate Ion

Carbonate Ion - GCSE Chemistry Definition

Reviewed by: Philippa Platt

Published

The carbonate ion is a negatively charged polyatomic ion with the chemical formula CO32-. It consists of one carbon atom centrally bonded to three oxygen atoms, forming a trigonal planar shape. Commonly found in minerals and rocks such as limestone and chalk, the carbonate ion plays an important role in both geological processes and the carbon cycle.

In the context of GCSE Chemistry, students should understand that carbonate ions react with acids to produce carbon dioxide gas, a reaction often used to test for the presence of carbonates in a substance. This ion is also integral to various everyday compounds, including substances like calcium carbonate found in antacid tablets.

Examiner-written GCSE Chemistry revision resources that improve your grades 2x

  • Written by expert teachers and examiners
  • Aligned to exam specifications
  • Everything you need to know, and nothing you don’t
GCSE Chemistry revision resources

Share this article

Philippa Platt

Reviewer: Philippa Platt

Expertise: Chemistry Content Creator

Philippa has worked as a GCSE and A level chemistry teacher and tutor for over thirteen years. She studied chemistry and sport science at Loughborough University graduating in 2007 having also completed her PGCE in science. Throughout her time as a teacher she was incharge of a boarding house for five years and coached many teams in a variety of sports. When not producing resources with the chemistry team, Philippa enjoys being active outside with her young family and is a very keen gardener

The examiner written revision resources that improve your grades 2x.

Join now