Which species is carbonate ion?

Study for the IMAT Chemistry Exam. Access flashcards and multiple choice questions; hints and explanations included for each question. Prepare effectively for your exam.

Multiple Choice

Which species is carbonate ion?

Explanation:
Carbonate ion is CO3^2-, a polyatomic ion with one carbon atom bonded to three oxygens and a total charge of -2, with the negative charge delocalized over the oxygens by resonance. NaCO3 is sodium carbonate, a compound containing the carbonate ion; HCO3^- is bicarbonate with a -1 charge; CO3^3- would have -3 charge and is not the carbonate ion. So the carbonate ion is CO3^2-.

Carbonate ion is CO3^2-, a polyatomic ion with one carbon atom bonded to three oxygens and a total charge of -2, with the negative charge delocalized over the oxygens by resonance. NaCO3 is sodium carbonate, a compound containing the carbonate ion; HCO3^- is bicarbonate with a -1 charge; CO3^3- would have -3 charge and is not the carbonate ion. So the carbonate ion is CO3^2-.

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