What are carbonate ions and how can you recognize them?

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What are carbonate ions and how can you recognize them?

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Answer 1 · 2017-03-27T04:45:36

Well, carbonate ions are represented by $C O_{3}^{2 -}$ $CO_3^(2-)$ .

Explanation:

And how to demonstrate the presence of $C O_{3}^{2 -}$ $CO_3^(2-)$ ?

Well, you must acidify the solution, and collect the evolved carbon dioxide.

The reactions that occur here are (i):

$C O_{3}^{2 -} + 2 H^{+} \to C O_{2} (a q) + H_{2} O (l)$ $CO_3^(2-) + 2H^(+) rarr CO_2(aq) + H_2O(l)$

And (ii):

$C O_{2} (a q) + C a {(O H)}_{2} (a q) \to C a C O_{3} (s) ⏐ ↓ + H_{2} O (l)$ $CO_2(aq) + Ca(OH)_2(aq) rarr CaCO_3(s)darr + H_2O(l)$

Precipitation of calcium carbonate is not straightforwardly observed, and if you do this in the lab, it is a good idea to use authentic carbonates so that you know for what you are looking.

The alkaline earths (Group 2) form binary carbonates that are (reasonably) insoluble in water.

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What are carbonate ions and how can you recognize them?

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