The pH of the 0.1 M HCl solution is
Correct answer: D. 1
- A. 0.01
- B. 0.1
- C. 0.2
- D. 1
Explanation
The pH of a solution is determined by the negative logarithm of the hydrogen ion concentration (pH = -log[H+]). For a 0.1 M HCl solution, the concentration of hydrogen ions [H+] is 0.1 M because HCl is a strong acid and dissociates completely. Therefore, the pH = -log(0.1) = 1. Option A (0.01), Option B (0.1), and Option C (0.2) are incorrect as they do not reflect the correct calculation using the logarithmic pH formula.
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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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