Continuing into the world of acids and bases…

pH of a solution is the negative logarithm of the hydrogen ion concentration pH = -log [H+]

This number represents how strong or weak an acid/base is

The pH scale ranges from 1-14 pH less than 7 is an acid the lower pH = the stronger the acid

pH greater than 7 is a base the higher the pH = the stronger the base

Find the pH if the hydrogen concentration are as follows:

a) 1.0 x 10-2 M

b) 3.0 x 10-6 M

c) 0.0055 M

pOH = - log [OH-]

Everything is the opposite pOH less than 7 = base The lower the pOH, stronger the base pOH greater than 7 = acid The higher the pOH, stronger the acid

Find the pOH for the following hydroxide concentrations:

a) 1.0 x 10-6 M

b) 0.000033 M

pH + pOH = 14

Find the pH if a solution has the following hydroxide concentration:

[OH-] = 8.2 x 10-6 M

What if you are given the pH and want to find the concentration of hydrogen ions?

[H+] = 10-pH

1) What is the [H+] if the pH is 8.9?

2) What about if the pH is 2.3?

Kw = 1.0x 10-14 M

1.0 x 10-14 = [H+] [OH-]