A solution with a pKa = -7 is a:
Correct answer: B. Strong acid
- A. Strong base
- B. Strong acid
- C. Neutral
- D. Weak acid
Explanation
The pKa is a measure of acid strength, with lower values indicating stronger acids. A very low or negative pKa value, such as -7, signifies a very strong acid that dissociates completely in solution.
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About Acids, Bases and Salts
Acid and base behaviour is explained through the Bronsted-Lowry transfer of protons and the Lewis donation or acceptance of electron pairs. The topic includes pH, pOH, ionisation and water equilibrium, plus salt formation and hydrolysis, where a salt solution may become acidic, basic or neutral.
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