Answer:
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
pH is the measurement of the hydronium ion concentration to depict the acidity of the solution. The pH of the mixture will be 9.25.
pH is the hydrogen potential in an aqueous solution that depicts the acidic or the basic character of the substance.
The reaction between ammonia and hydrochloric acid can be shown as:
[tex]\rm NH_{3} + HCl \rightarrow NH_{4}^{+} + Cl^{-}[/tex]
The molarity of ammonia and ammonium ion is 0.010 M.
The pH of the solution is estimated by the Hendeson- Hasselbalch equation:
[tex]\begin{aligned} \rm pH &= \rm pKa + log_{10} \rm \dfrac{[NH_{3}]}{[NH_{4}]^{+}}\\\\&= 9.25 + \rm log _{10} \dfrac{[0.010]}{[0.010]}\\\\&= 9.25 \end{aligned}[/tex]
Therefore, 9.25 is the pH of the solution.
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