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ACT Exam  >  ACT Questions  >  Acetic acid’s pKais 4.2 and ammonium hy... Start Learning for Free
Acetic acid’s pKa is 4.2 and ammonium hydroxide pKb is 3.24. What is the pH of the ammonium acetate solution?
  • a)
    7.12
  • b)
    7
  • c)
    4.2
  • d)
    7.48
Correct answer is option 'D'. Can you explain this answer?
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Acetic acid’s pKais 4.2 and ammonium hydroxide pKbis 3.24. What ...
We know that the pH of the solution of a weak acid and a weak base is given by 1/2pKW + 1/2pKa – 1/2pKb. So pH = 7 + 12[4.2 – 3.24]; pH = 7 + 0.48 = 7.48, we get this by substituting acetic acid’s pKa as 4.2 and ammonium hydroxide pKb as 3.24.
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Acetic acid’s pKais 4.2 and ammonium hydroxide pKbis 3.24. What ...


Calculation of pH of Ammonium Acetate Solution

Ammonium acetate is a salt formed by the reaction of acetic acid and ammonium hydroxide. When dissolved in water, it dissociates into ammonium ions (NH4+) and acetate ions (CH3COO-).

Step 1: Calculate the concentration of NH4+ and CH3COO-
- The initial concentration of NH4+ is the same as the concentration of ammonium acetate, as it fully dissociates.
- The initial concentration of CH3COO- is also the same as the concentration of ammonium acetate, as it fully dissociates.

Step 2: Calculate the equilibrium concentration of acetic acid (CH3COOH)
- Due to the reaction NH4+ + CH3COO- ⇌ CH3COOH + NH3, the concentration of CH3COOH increases by the same amount as the NH4+ ion concentration.

Step 3: Calculate the equilibrium concentration of NH3
- Due to the reaction NH4+ + CH3COO- ⇌ CH3COOH + NH3, the concentration of NH3 increases by the same amount as the CH3COO- ion concentration.

Step 4: Calculate the pH of the solution
- Use the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]).
- Substitute the values for pKa, [A-] (CH3COO-), and [HA] (CH3COOH) to find the pH of the solution.

Therefore, the pH of the ammonium acetate solution is 7.48 (option D).
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Acetic acid’s pKais 4.2 and ammonium hydroxide pKbis 3.24. What is the pH of the ammonium acetate solution?a)7.12b)7c)4.2d)7.48Correct answer is option 'D'. Can you explain this answer?
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Acetic acid’s pKais 4.2 and ammonium hydroxide pKbis 3.24. What is the pH of the ammonium acetate solution?a)7.12b)7c)4.2d)7.48Correct answer is option 'D'. Can you explain this answer? for ACT 2025 is part of ACT preparation. The Question and answers have been prepared according to the ACT exam syllabus. Information about Acetic acid’s pKais 4.2 and ammonium hydroxide pKbis 3.24. What is the pH of the ammonium acetate solution?a)7.12b)7c)4.2d)7.48Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for ACT 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Acetic acid’s pKais 4.2 and ammonium hydroxide pKbis 3.24. What is the pH of the ammonium acetate solution?a)7.12b)7c)4.2d)7.48Correct answer is option 'D'. Can you explain this answer?.
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