A solution with pKa = -7, is
Correct answer: B. Strong acid
- A. Strong base
- B. Strong acid
- C. Neutral
- D. Weak acid
Explanation
The pKa value is an indicator of the strength of an acid. The lower the pKa value, the stronger the acid. A pKa of -7 is extremely low, indicating that the acid is very strong. Strong acids completely dissociate in water, which is consistent with a low or negative pKa value. Conversely, strong bases would be associated with high pKb values, and a neutral solution is not described by pKa. Weak acids have higher pKa values, generally above 0.
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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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