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What is the pH of a 0.1 M solution of potassium hydrogen phthalate (KHP)?

Practice Questions

Q1
What is the pH of a 0.1 M solution of potassium hydrogen phthalate (KHP)?
  1. 4.0
  2. 5.0
  3. 6.0
  4. 7.0

Questions & Step-by-Step Solutions

What is the pH of a 0.1 M solution of potassium hydrogen phthalate (KHP)?
  • Step 1: Understand that potassium hydrogen phthalate (KHP) is a weak acid.
  • Step 2: Know that weak acids do not completely dissociate in water.
  • Step 3: Find the pKa value of KHP, which is approximately 5.0.
  • Step 4: Use the pKa value to estimate the pH of the solution.
  • Step 5: Since the concentration of KHP is 0.1 M, the pH will be close to the pKa value.
  • Step 6: Conclude that the pH of a 0.1 M solution of KHP is around 5.0.
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