If the pH of a solution is 11, what is the concentration of hydroxide ions [OH-]

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Question: If the pH of a solution is 11, what is the concentration of hydroxide ions [OH-] in the solution?

Options:

Correct Answer: 1 x 10^-2 M

Solution:

pOH = 14 - pH = 3, [OH-] = 10^-3 M.

If the pH of a solution is 11, what is the concentration of hydroxide ions [OH-] in the solution?

If the pH of a solution is 11, what is the concentration of hydroxide ions [OH-] in the solution?

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 the pOH.
Step 3: Since the pH is given as 11, calculate the pOH by subtracting the pH from 14: pOH = 14 - 11.
Step 4: Perform the calculation: pOH = 3.
Step 5: Now, use the relationship between pOH and hydroxide ion concentration: [OH-] = 10^(-pOH).
Step 6: Substitute the pOH value into the equation: [OH-] = 10^(-3).
Step 7: Calculate the concentration: [OH-] = 0.001 M or 10^-3 M.

pH and pOH Relationship – The relationship between pH and pOH is defined by the equation pH + pOH = 14, which is fundamental in acid-base chemistry.
Hydroxide Ion Concentration – The concentration of hydroxide ions [OH-] can be calculated from pOH using the formula [OH-] = 10^(-pOH).