Question:
The pOH value of a solution whose hydroxide ion concentration is \( 6.2 \times 10^{-9} \, \text{mol/litre} \) is:
The pOH value of a solution whose hydroxide ion concentration is \( 6.2 \times 10^{-9} \, \text{mol/litre} \) is:
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To find pOH, take the negative logarithm of the hydroxide ion concentration.
Updated On: Mar 25, 2026
- 8.21
- 6.21
- 7.75
- 7.21
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The Correct Option is A
Solution and Explanation
Step 1: pOH and concentration relation.
The pOH is related to the hydroxide ion concentration \( [OH^-] \) by the equation: \[ \text{pOH} = -\log [OH^-] \] Substituting the given concentration \( 6.2 \times 10^{-9} \, \text{mol/litre} \), we get: \[ \text{pOH} = -\log (6.2 \times 10^{-9}) = 8.21 \] Thus, the correct answer is (1).
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