alleryStart learning →What is the value of the ion product constant for water at 25 degrees Celsius?
A1.0 x 10^-7
B1.0 x 10^-13
C5.6 x 10^-13
D1.0 x 10^-14
Answer & Solution
Correct answer: D. 1.0 x 10^-14
1. The autoionisation constant is the product of the hydronium and hydroxide concentrations.
2. At 25 degrees Celsius that product takes the value 1.0 x 10^-14.
3. The figure 1.0 x 10^-7 is each individual ion concentration, not their product.
4. The value 5.6 x 10^-13 belongs to water at 100 degrees Celsius instead.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 14 "Acid-Base Equilibria", section 14.1 Brønsted-Lowry Acids and Bases_
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