Which of the following pairs of ions is arranged so that the ion with the larger (i.e., more negative) heat of hydration is listed first? A)Br ⁻, K ⁺ B)Mg ²⁺, Sr ²⁺ C)Ca ²⁺, Sc ³⁺ D)Na ⁺, Li ⁺ E)None of these choices are correct.

Question

Quizplus · Accepted Answer

In Mg and Sr, both have the same charge but Sr has a larger ionic radius than Mg. Thus, Sr will have a larger heat of hydration since the water molecules have to adjust more to accommodate the larger ion. Thus, the pair is arranged in the correct order with Sr listed first.

Which of the Following Pairs of Ions Is Arranged So