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MHT CET Medical202624 April 2026Morning ShiftChemistryIonic EquilibriumActual

Calculate the amount of NaOH in g/L in a one L solution of it with the pH of 12. (Molar mass of NaOH =40 g/mol)

Options

  1. A0.4 g/L
  2. B2 g/L
  3. C4 g/L
  4. D0.2 g/L

Correct answer

A. 0.4 g/L

Step-by-step solution

Given pH = 12 pOH = 14 - pH = 14 - 12 = 2 [ OH ⁻] = 10^ - pOH = 10⁻² M = 0.01 M Since NaOH is a strong base, it dissociates completely. [ NaOH ] = [ OH ⁻] = 0.01 M Amount of NaOH in g/L = Molarity Molar mass Amount = 0.01 mol/L 40 g/mol = 0.4 g/L Answer: 0.4 g/L

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