Calculate the pH p H of each solution and indicate whether the solution is acidic or basic.

Question

[H3O+]=5.3×10^-5M

[OH−]=6.6×10^-3M

Answer 1

Good afternoon, Kayla.

When given [H₃O⁺] = 5.3 x 10^-5M, you will need to calculate the opposite log of 5.3 x 10^-5. As long as your calculator has a "log" key, this is quite easy.

-log(5.3 x 10^-5) = 4.28

The pH = 4.28. The solution is acidic because the pH is less than 7.00

In the second problem, you can calculate the opposite log of the [OH^-]. That will give you the pOH. Then because pH + pOH = 14, you can easily calculate the pH.

-log(6.6 x 10^-3) = 2.18

The pOH is 2.18.

14.00 - 2.18 = 11.82

The pH is 11.82. The solution is basic because the pH is greater than 7.00