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Question
The concentration of hydroxide ion in a water sample is found to be 2.5 × 10−6 M. Identify the nature of the solution.
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Solution
The concentration of OH ion in a water sample is found to be 2.5 × 10−6 M
pOH = – log10 [OH–]
pOH = – log10 [2.5 × 10−6]
= – log10 [2.5] – log10 [10−6]
= – 0.3979 – (– 6)
= – 0.3979 + 6
pOH = 5.6
We know that,
pH + pOH = 14
pH + 5.6 = 14
pH = 14 – 5.6
pH = 8.4
pH = 8.4, shows the nature of the solution is basic.
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