Question

Ph of a solution is 5. Its hydroxyl ion concentration is
1) 5
2) 10
3) 10^-5
4) 10^-9

Answer 1

pH= 5

So, pOH= 9

So hydroxyl ion concentration = 10 raise to -9.

Answer 2

Its hydroxyl ion concentration is$10^{-9}M$

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.

Acids have pH ranging from 1 to 6.9, bases have pH ranging from 7.1 to 14 and neutral solutions have pH equal to 7.

$pH=-\log [H^+]$

$pOH=-\log[OH^-]$

Putting in the values:

$5=-\log[H^+]$

$[H^+]=10^{-5}$

$[H^+][OH^-]=10^{-14}$

$[OH^-]=\frac{10^{-14}}{10^{-5}}=10^{-9}M$

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