Question

What is the hydroxide ion concentration of a solution with a ph of 8. 25?

Answer 1

The concentration of hydroxide ion of a solution with a pH of 8. 25 is 1.77×$10^{6}$ M

Calculation,

The pH of a solution tells us about concentration of the $H^{+$ ion ( proton ) in solution. However, if we know the value of pH , we can calculate pOH with the help of pH and from pOH we can find concentration of hydroxide ions in the solution.

pH + pOH = 14

8. 25 + pOH = 14

pOH = 14 - 8. 25 = 5.75

Since, pH = -㏒[ $H^{+$ ]

Similarly, pOH = -㏒[$OH^{-$ ]

If pOH = 5.75 , that means that -㏒[$OH^{-$ ]  = 5.75 ,which means that,

[$OH^{-$ ]  = $10^{-5.75}$ = 1.77×$10^{6}$.

So, we know that the concentration of the $OH^{-$ ions in the solution with pH of 8.25 is 1.77×$10^{6}$ Molar

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