Multiple Choice
Which of the following is the correct molecular equation for the reaction between sodium chloride and sodium carbonate in aqueous solution?
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6. Chemical Quantities & Aqueous Reactions
Molecular Equations
Multiple Choice
Which one of the following is the correct dissociation equation for Li2CO3 in water?
A
Li2CO3 (aq) → 2 Li (s) + CO3 (g)
B
Li2CO3 (aq) → 2 Li^+ (aq) + CO3^{2-} (aq)
C
Li2CO3 (aq) → Li2^+ (aq) + CO3^− (aq)
D
Li2CO3 (aq) → Li^+ (aq) + CO3^{2-} (aq)
Verified step by step guidance1
Identify the compound given: Li2CO3 is lithium carbonate, an ionic compound composed of lithium ions (Li^+) and carbonate ions (CO3^{2-}).
Recall that when ionic compounds dissolve in water, they dissociate into their constituent ions, each carrying their characteristic charges.
Write the dissociation equation by splitting Li2CO3 into its ions: since there are 2 lithium ions per formula unit, write 2 Li^+ ions, and one carbonate ion CO3^{2-}.
Express the dissociation equation with aqueous ions and their charges, ensuring charge balance: \(\mathrm{Li_2CO_3 (aq) \rightarrow 2\ Li^{+} (aq) + CO_3^{2-} (aq)}\).
Verify that the equation is balanced in terms of both atoms and charge, confirming it represents the correct dissociation in water.
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