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JEE Main20199 Jan 2019Morning ShiftChemistryIonic EquilibriumActual

20   ml of 0.1 M H 2 SO 4   solution is added to 30   mL of 0 .2   M   NH 4 OH solution. The pH of the resultant mixture is: pk b of NH 4 OH = 4 .7

Options

  1. A5.0
  2. B5.2
  3. C9.4
  4. D9.0

Correct answer

D. 9.0

Step-by-step solution

Millimoles of H 2 S O 4 = 20 × 0.1 = 2 Millimoles of N H 4 O H = 30 × 0.2 = 6 Hence, the solution will act as a basic buffer. p O H = p K b + l o g s a l t B a s e N H 4 + = 2 × N H 4 2 S O 4 ;                   N H 4 + = 4 p O H = p K b + l o g N H 4 + N H 3 = 4.7 + l o g 4 2 = 4.7 + 0.3010 = 5.010 p H = 14 - p O H = 9

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