MDCAT Chemistry MCQ #2250

The ionic product of water, Kw, is measured at 40 degrees Celsius. How does this value compare to the standard value at 25 degrees Celsius?

MDCAT Chemistry MCQ #2250

  1. Question 1

    Q1. The ionic product of water, Kw, is measured at 40 degrees Celsius. How does this value compare to the standard value at 25 degrees Celsius?

    • A) Exactly 1.0 x 10^-14
    • B) Less than 1.0 x 10^-14
    • C) Greater than 1.0 x 10^-14
    • D) Exactly 7.0 x 10^-7

    Answer: Greater than 1.0 x 10^-14

    Explanation: Water dissociation is endothermic, so Kw increases with temperature. Option A is wrong because 1.0 x 10^-14 is only at 25 degrees.