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Multiple Choice
Which of the following is not a characteristic of a strong acid?
A
Has a high pKa value
B
Completely ionizes in solution
C
Has a low pH when dissolved in water
D
Donates protons easily
Verified step by step guidance
1
Understand the definition of a strong acid: A strong acid is one that completely ionizes in solution, meaning it donates all its available protons (H⁺ ions) to the solution.
Recall the relationship between pKa and acid strength: The pKa value is a measure of the strength of an acid. A lower pKa value indicates a stronger acid because it implies the acid donates protons more readily.
Consider the pH of a solution: A strong acid, when dissolved in water, results in a low pH because it increases the concentration of H⁺ ions in the solution.
Evaluate the given options: 'Completely ionizes in solution' and 'Has a low pH when dissolved in water' are characteristics of strong acids. 'Donates protons easily' is also a characteristic of strong acids.
Identify the incorrect characteristic: 'Has a high pKa value' is not a characteristic of a strong acid, as strong acids have low pKa values.