The pH of buffer solution is 4.74 on adding 0.1 ml (0.0001M) HCl, the pH of solution will be
Correct answer: D. 4.74
- A. 5.2
- B. 5.3
- C. 5.7
- D. 4.74
Explanation
The correct answer is 4.74. A buffer solution has the ability to resist changes in pH upon the addition of small amounts of acid or base. In this question, the addition of 0.1 ml of 0.0001M HCl is a very small amount relative to the buffer capacity, so the pH remains unchanged at 4.74. The other options suggest significant changes in pH, which are not typical for a buffer 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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