0.1 M HCl has pH = 1.0, it is about 100 times stronger than nitric acid. Then pH of acetic acid will be

Correct answer: D. 3.0

  • A. 1.3
  • B. 2.0
  • C. 0.1
  • D. 3.0

Explanation

The correct answer is 3.0. Acetic acid is a weak acid, which means it doesn't dissociate completely in water. The pH of a 0.1 M solution of a weak acid like acetic acid is typically around 3.0, reflecting its partial ionization. In contrast, strong acids like HCl dissociate completely, resulting in a lower pH. Therefore, the pH of acetic acid is higher (less acidic) compared to strong acids like HCl.The other options are incorrect because they do not accurately represent the typical pH of a weak acid like acetic acid. Option A (1.3) and Option B (2.0) suggest higher acidity than is true for acetic acid, while Option C (0.1) is outside the typical pH range and misrepresents the logarithmic nature of the pH scale.

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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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