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What is the concentration of hydroxide ions in a solution with a pH of 11?

Practice Questions

Q1
What is the concentration of hydroxide ions in a solution with a pH of 11?
  1. 1 x 10^-3 M
  2. 1 x 10^-4 M
  3. 1 x 10^-5 M
  4. 1 x 10^-6 M

Questions & Step-by-Step Solutions

What is the concentration of hydroxide ions in a solution with a pH of 11?
  • Step 1: Understand that pH is a measure of how acidic or basic a solution is.
  • Step 2: Know that pH + pOH = 14. This means if you have the pH, you can find pOH.
  • Step 3: Since the pH is given as 11, calculate pOH by subtracting pH from 14: pOH = 14 - 11.
  • Step 4: Perform the subtraction: 14 - 11 = 3. So, pOH = 3.
  • Step 5: Now, to find the concentration of hydroxide ions [OH-], use the formula: [OH-] = 10^-pOH.
  • Step 6: Substitute pOH into the formula: [OH-] = 10^-3.
  • Step 7: Calculate 10^-3, which equals 0.001 M. This means the concentration of hydroxide ions is 0.001 M.
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