What is the OH- concentration in 0.150 M HClO4?

Expert Answers
gsenviro eNotes educator| Certified Educator

Perchloric acid (HClO4) is a strong acid and dissociates completely in water to give a proton (H+) and perchlorate ion (ClO4-).

Thus, the hydrogen ion concentration in the given solution is:

[H+] = [HClO4] = 0.15 M

Since in a given solution, the product of concentrations of hydrogen ion and hydroxide ion is always equal to 10^-14, we can use this to calculate the concentration of hydroxide ions in the solution.

In other words, [H+] x [OH-] = 10^-14

or, [OH-] = 10^-14 / [H+] = 10^-14 / 0.15 = 6.67 x 10^-14 M

We can also use these numbers to calculate pH and pOH of the solution.

pH = - log [H+] = - log (0.15) = 0.824

and pOH = 14 - pH = 14 - 0.824 = 13.176

Hope this helps.


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