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Question

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GPT-4o mini · Answer

To determine which solution is a base, we can refer to the pH scale. A pH value less than 7 indicates an acidic solution, a pH of 7 indicates a neutral solution, and a pH greater than 7 indicates a basic (alkaline) solution.

Here's the breakdown of the pH values for each solution:

Solution A: pH 2 (acidic)
Solution B: pH 5 (acidic)
Solution C: pH 7 (neutral)
Solution D: pH 9 (basic)

Since Solution D has a pH greater than 7, it should be identified as the base.

Answer: Solution D