WEBVTT

1
00:00:00.000 --> 00:00:06.954
Here is the problem: Find the pH of a solution with [H to the power plus ] equals 0.01 M.

2
00:00:07.404 --> 00:00:16.309
Convert between hydrogen ion concentration, hydroxide concentration, pH and pOH in water at 25 °C.

3
00:00:17.109 --> 00:00:18.003
pH.

4
00:00:18.453 --> 00:00:27.741
pOH and [OH to the power minus ] (25 °C, Kw equals 1.0 times 10 to the power minus 14).

5
00:00:28.541 --> 00:00:42.740
So the answer is pH equals 2, pOH equals 12, [H to the power plus ] equals 0.01 M, [OH to the power minus ] equals 1 times 10 to the power negative 12 M (acidic).

6
00:00:43.190 --> 00:00:55.903
pH is a logarithmic scale: each unit is a tenfold change in hydrogen ion concentration. Below 7 the solution is acidic, above 7 it is basic, at 25 °C.

7
00:00:56.703 --> 00:01:07.860
[H to the power plus ][OH to the power minus ] equals 1 times 10 to the power negative 14 approximately 1.0 times 10 to the power negative 14.

8
00:01:08.310 --> 00:01:09.796
The solution is acidic.