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What is the pH of a 0.1 M solution of hydrochloric acid (HCl)?

Practice Questions

Q1
What is the pH of a 0.1 M solution of hydrochloric acid (HCl)?
  1. 1
  2. 0.1
  3. 10
  4. 0

Questions & Step-by-Step Solutions

What is the pH of a 0.1 M solution of hydrochloric acid (HCl)?
  • Step 1: Understand that hydrochloric acid (HCl) is a strong acid, which means it completely dissociates in water.
  • Step 2: Know that when HCl dissociates, it produces hydrogen ions (H+). For a 0.1 M solution of HCl, the concentration of H+ ions is also 0.1 M.
  • Step 3: Use the formula for pH, which is pH = -log[H+].
  • Step 4: Substitute the concentration of H+ into the formula: pH = -log(0.1).
  • Step 5: Calculate the logarithm: log(0.1) is equal to -1.
  • Step 6: Therefore, pH = -(-1) = 1.
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