Which one of the following shows what happens to CaBr2 solid after it dissolves in water?

When solid calcium bromide (CaBr₂) dissolves in water, it dissociates into its constituent ions. The correct representation of this process can be found in option A. Here’s the breakdown:

• A) Ca²⁺ (aq) + 2Br^– (aq): This is the correct choice because when CaBr₂ dissolves, it separates into calcium ions (Ca²⁺) and bromide ions (Br^–) in the aqueous solution.
• B) Ca (s) + Br₂ (g): This is incorrect as it suggests that solid calcium and gaseous bromine are produced, which is not what occurs during dissolution.
• C) Ca²⁺ (aq) + 2Br (aq): Here, Br should be written as Br^– to indicate the bromide ion. Thus, this option is not accurately representing the dissociation.
• D) Ca (l) + 2Br (l): This option is incorrect as it implies that liquid calcium and liquid bromine are produced, which does not happen in this reaction.

In summary, the dissolution of CaBr₂ in water results in the formation of calcium ions and bromide ions, making option A the right choice.