Question

a scientist working in a lab wants to determine the precise ph of a solution. which tool should the scientist use to measure ph? a. a strip of ph paper b. a ph indicator c. a ph meter d. a ph scale

Explanation:

• Option A: pH paper gives a rough estimate of pH by color change, not precise.
• Option B: pH indicators (like litmus) show broad pH ranges, not precise measurements.
• Option C: A pH meter uses electrodes to measure the hydrogen ion concentration precisely, giving a numerical value with high accuracy.
• Option D: A pH scale is a conceptual scale (0 - 14) for classifying acidity/alkalinity, not a measuring tool.

Answer:

C. A pH meter