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What is the effect of dilution on the pH of a weak acid solution?

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Question: What is the effect of dilution on the pH of a weak acid solution?

Options:

  1. pH decreases
  2. pH increases
  3. pH remains constant
  4. pH becomes neutral

Correct Answer: pH increases

Solution: 

Dilution of a weak acid decreases its concentration, which shifts the equilibrium to the right, increasing the concentration of H+ ions and thus increasing the pH.

What is the effect of dilution on the pH of a weak acid solution?

Practice Questions

Q1
What is the effect of dilution on the pH of a weak acid solution?
  1. pH decreases
  2. pH increases
  3. pH remains constant
  4. pH becomes neutral

Questions & Step-by-Step Solutions

What is the effect of dilution on the pH of a weak acid solution?
  • Step 1: Understand what a weak acid is. A weak acid does not completely dissociate in water, meaning it does not release all of its H+ ions.
  • Step 2: Know what dilution means. Dilution is when you add more water to a solution, which decreases the concentration of the acid.
  • Step 3: Recognize that when you dilute a weak acid, you lower the concentration of the acid molecules in the solution.
  • Step 4: Remember that the equilibrium of a weak acid is a balance between the acid and its ions (H+ and its conjugate base).
  • Step 5: When you dilute the weak acid, the system tries to restore balance by shifting the equilibrium to the right, producing more H+ ions.
  • Step 6: As the concentration of H+ ions increases, the pH of the solution decreases (since pH is inversely related to H+ concentration).
  • Step 7: Conclude that dilution of a weak acid actually increases the pH, making the solution less acidic.
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