If acid reacts with water they should dissociate into positively and negatively charged ions but why not in the case of co32-?

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Solution

It's true that acids dissociate in water to their respective ions. For example; acetic acid forms acetate ion and hydronium ion in water.

CH3COOH + H2O <---> CH3COO- + H3O+

CO3-2 ion cannot dissociate further as it is not an acid but an ion. It is formed by dissociation of carbonic acid which is a weak organic acid.

H2CO3 <------> 2H+ + CO3-2

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