Question

Calculate the pH of the following:
1. [H+] = 1 x 10-7 M


2. [OH-] = 1 x 10-3 M

3. [H+] = 1 x 10-2 M


4. [H+] = 1 x 10-10 M


5. [OH-] = 1 x 10-8 M

Answer 1

The pH can be defined as the negative logarithm of the hydrogen ion concentration of the solution.

What is the pH?

What we call the pH can be defined as the negative logarithm of the hydrogen ion concentration of the solution. We are aware that we can use the relation [H+]  [OH-]  = 1 * 10^-14 to handle the enormity of this problem.

Now, let us go about solving the problems;

1. pH = -log(1 x 10-7) = 7

2.  [H+]=  1 * 10^-14/ 1 x 10^-3

pH =  -log(  1 * 10^-11)

pH = 11

3. pH = -log( 1 x 10^-2)

pH = 2

4. pH = -log(  1 x 10^-10)

pH = 10

5.  [H+]=  1 * 10^-14/ 1 x 10^-8

[H+]=  1 * 10^-6

pH = 6

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