What is the formula of the carbonate ion?

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Study for the IGCSE Edexcel Chemistry Test. Access flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

What is the formula of the carbonate ion?

Explanation:
The carbonate ion is a polyatomic ion that carries a negative two charge. Its composition is one carbon atom with three oxygen atoms, so the formula is CO3 with a 2− charge. The -2 arises because three oxygens each contribute -2, totaling -6, while carbon contributes +4 to balance, giving an overall -2. That’s why the correct representation is CO3 2−; the other charges would not match the ion’s actual charge.

The carbonate ion is a polyatomic ion that carries a negative two charge. Its composition is one carbon atom with three oxygen atoms, so the formula is CO3 with a 2− charge. The -2 arises because three oxygens each contribute -2, totaling -6, while carbon contributes +4 to balance, giving an overall -2. That’s why the correct representation is CO3 2−; the other charges would not match the ion’s actual charge.

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