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BITSAT2022ChemistryIonic EquilibriumActual

What is [ NH ₄⁺ ] in a solution that is 0.02 M NH ₃0.01 M KOH ? [K_b ( NH ₃ )=1.8 10⁻⁵ ]

Options

  1. A3.6 10⁻⁵ M
  2. B1.8 10⁻⁵ M
  3. C0.9 10⁻⁵ M
  4. D7.2 10⁻⁵ M

Correct answer

A. 3.6 10⁻⁵ M

Step-by-step solution

NH ₄ OH NH ₄⁺+ OH ⁻K_b= [ NH ₄⁺ ] [ OH ⁻ ] [ NH ₄ OH ] 1.8 10⁻⁵= [ NH ₄⁺ ][0.01] [0.02] [ NH ₄⁺ ]=3.6 10⁻⁵ M

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