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NTA Abhyas NEET2020ChemistryChemical EquilibriumPractice

For the preparation of a buffer of p H = 8.26 , the amount of NH 4 2 SO 4 required to be mixed with one litre of 0.1 M N H 3 a q , p K b = 4.74 is ?

Options

  1. A1.0  moles
  2. B10.0   m o l e s
  3. C0.50   m o l e s
  4. D5  moles

Correct answer

C. 0.50   m o l e s

Step-by-step solution

pOH = pK b + log NH 4 + NH 3 5.74 = 4.74 + log NH 4 + 0.1 or log ⁡ N H 4 + 0.1 = 1 or N H 4 + 0.1 = 10 or N H 4 + = 1 M ∴ NH 4 +   2 SO 4 required = 0.5  mole

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