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Which statement about pH is correct? A - AQA - A-Level Chemistry - Question 13 - 2020 - Paper 3
Question 13
Which statement about pH is correct? A. The pH of a weak base is independent of temperature. B. At temperatures above 298 K, the pH of pure water is less than 7. ... show full transcript
Worked Solution & Example Answer:Which statement about pH is correct? A - AQA - A-Level Chemistry - Question 13 - 2020 - Paper 3
Step 1
B. At temperatures above 298 K, the pH of pure water is less than 7.
Answer
As the temperature increases, the autoionization of water results in an increase in the concentration of hydrogen ions. At temperatures above 298 K, water exhibits a pH lower than 7, indicating a more acidic environment. Thus, statement B is correct.