Question

which one of the following is the correct dissociation equation for li₂co₃? a li⁺(aq) + co₃²⁻(aq) → li₂co₃(s) b li₂co₃(s) → 2li⁺(aq) + co₃²⁻(aq) c li₂co₃(s) → li⁺(aq) + co₃²⁻(aq) d li₂co₃(s) → li⁺(aq) + c⁴⁻(aq) + 3o²⁻(aq)

Explanation:

Step1: Recall dissociation concept

Dissociation of a compound in aqueous solution breaks it into its constituent ions. Lithium carbonate ($Li_2CO_3$) is an ionic compound.

Step2: Determine ion - charges and ratios

Lithium has a + 1 charge ($Li^+$) and carbonate has a - 2 charge ($CO_3^{2 - }$). For the compound $Li_2CO_3$, when it dissociates, 1 mole of $Li_2CO_3$ should produce 2 moles of $Li^+$ and 1 mole of $CO_3^{2 - }$.

Step3: Analyze options

• Option A is a combination reaction, not a dissociation reaction.
• Option B: $Li_2CO_3(s)

ightarrow2Li^+(aq)+CO_3^{2 - }(aq)$ is the correct dissociation equation as it follows the correct ion - production based on the formula of $Li_2CO_3$.

• Option C has an incorrect ratio of $Li^+$ ions (should be 2 moles of $Li^+$).
• Option D has an incorrect breakdown of the carbonate ion. Carbonate ion ($CO_3^{2 - }$) does not dissociate into $C^{4 - }$ and $O^{2 - }$ in this simple dissociation process.

Answer:

B. $Li_2CO_3(s)
ightarrow2Li^+(aq)+CO_3^{2 - }(aq)$