pH of a solution, which has H+ ion concentration of 0.0002 mol dm-3
Correct answer: B. 3.69
- A. 3.0
- B. 3.69
- C. 4.5
- D. 2.69
Explanation
The pH of a solution is calculated by taking the negative logarithm (base 10) of the hydrogen ion concentration. In this case, the concentration of H+ ions is 0.0002 mol dm-3. Using the formula pH = -log[0.0002], we find the pH to be approximately 3.69. Option A (3.0) and Option D (2.69) are incorrect due to calculation errors, and Option C (4.5) is too high for the given concentration.
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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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