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NEET2014ChemistryIonic EquilibriumActual

A buffer solution is prepared in which the concentration of NH ₃ is 0.30 M and the concentration of NH ₄⁺ is 0.20 M . If the equilibrium constant, K_b for NH ₃ equals 1.8 10⁻⁵ , what is the pH of this solution? ( 2.7=0.43)

Options

  1. A9.43
  2. B11.72
  3. C8.73
  4. D9.08

Correct answer

A. 9.43

Step-by-step solution

aligned pOH = p K_b & + [ Salt ] [ Base ] & =- K_b+ [ Salt ] [ Base ] aligned aligned & =- 1.8 10⁻⁵+ 0.20 0.30 & =5-0.25+(-0.176) & =4.75-0.176=4.57 aligned pH =14-4.57=9.43

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