TEAS Science · Practice Question

    Acid-base chemistry: TEAS Practice Question with Answer & Explanation

    An original TEAS 7-style science practice question, written for nursing-school applicants — with a full breakdown of every answer choice.

    Question

    A solution with a pH of 3 is how many times more acidic than a solution with a pH of 5?

    • A.2 times
    • B.10 times
    • C.100 times
      Correct
    • D.1,000 times

    Correct answer: C. Each pH unit represents a tenfold change, so a two-unit difference represents 10², or 100 times.

    Why C is correct

    Each pH unit represents a tenfold change, so a two-unit difference represents 10², or 100 times.

    How to solve this TEAS question

    Identify what the question is testing, eliminate choices that conflict with the relevant rule or evidence, and then select the option that directly answers the prompt.

    Review the alternatives

    The other choices do not satisfy the scientific fact, mathematical operation, language rule, or reading evidence tested by this question. Always compare each option with the exact wording of the prompt before deciding.

    Quick study tip: Treat the pH scale as logarithmic, not linear.

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