When one formula unit of MgBr_2 is dissolved in water, how many individual ions are produced?

• A. 1 ion
• B. 2 ions
• C. 4 ions
• D. 3 ions

Answer: (D)

Verified step by step guidance

1. Identify the chemical formula of the compound: MgBr_2 consists of one magnesium ion (Mg) and two bromide ions (Br).
2. Understand that when an ionic compound dissolves in water, it dissociates into its constituent ions.
3. Write the dissociation equation for MgBr_2 in water: \(\mathrm{MgBr_2 (s) \rightarrow Mg^{2+} (aq) + 2Br^{-} (aq)}\).
4. Count the total number of ions produced from one formula unit: 1 magnesium ion + 2 bromide ions = 3 ions.
5. Conclude that dissolving one formula unit of MgBr_2 produces 3 individual ions in solution.