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6 November, 14:39

What is the ph of a solution that results from mixing together equal volumes of a 0.020 m solution of ammonia and a 0.010 m solution of hydrochloric acid? (pka of nh4 + = 9.25) ?

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  1. 6 November, 15:05
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    pH = 9.25

    Explanation:

    Reaction of ammonia (NH₃) with hydrochloric acid (HCl) is:

    NH₃ + HCl → NH₄⁺ + Cl⁻

    As equal volumes of a 0.020M solution of NH₃ and a 0.010M solution of react, molarity of NH₃ after reaction is 0.010M and 0.010M of NH₄⁺.

    For the buffer NH₄⁺/NH₃ H-H equation to find pH of solution is:

    pH = pKa + log₁₀ [NH₃] / [NH₄⁺]

    pH = 9.25 + log₁₀ [0.010M] / [0.010M]

    pH = 9.25
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