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What is the pH of a 0.01 M hydrochloric acid solution?

Practice Questions

Q1
What is the pH of a 0.01 M hydrochloric acid solution?
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Questions & Step-by-Step Solutions

What is the pH of a 0.01 M hydrochloric acid solution?
  • Step 1: Understand that hydrochloric acid (HCl) is a strong acid, which means it completely dissociates in water.
  • Step 2: Recognize that a 0.01 M solution of HCl means there are 0.01 moles of HCl in one liter of water.
  • Step 3: Since HCl completely dissociates, the concentration of hydrogen ions [H+] in the solution is also 0.01 M.
  • Step 4: Use the formula for pH, which is pH = -log[H+].
  • Step 5: Substitute the value of [H+] into the formula: pH = -log(0.01).
  • Step 6: Calculate the logarithm: log(0.01) is equal to -2.
  • Step 7: Therefore, pH = -(-2) = 2.
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