Which of the following will give a buffer solution with pH more than 7?
Correct answer: C. Weak base & its salt with a strong acid
- A. Weak acid & its salt with a strong base
- B. Weak acid & its salt with a weak base
- C. Weak base & its salt with a strong acid
- D. Weak base & its salt with a weak base
Explanation
The correct answer is Option C: 'Weak base & its salt with a strong acid'. A buffer solution with a pH greater than 7 is known as a basic buffer. Basic buffers are typically composed of a weak base and its salt with a strong acid. The weak base partially neutralizes the added strong acid, maintaining the solution's pH above 7. Options A and B involve weak acids, which do not contribute to a basic buffer, while Option D lacks the acid component necessary for buffering.
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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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