What is pH?. Concentration and hydrogen ions and hydroxide ions are a measure of The acidity and alkalinity of a solution. How was the concept of pH developed?. H 2 O is a molecule. Therefore, pure water does not conduct electricity. Or does it?.
What is pH?
Concentration and hydrogen ions and hydroxide ions are a measure of
The acidity and alkalinity of a solution.
H2 O is a molecule.
Therefore, pure water does not conduct electricity.
When pure water was found to conduct very small currents of electricity, the self-ionization of water was discovered.
H2 O H+ + OH-
Water can dissociate into Hydronium ions and hydroxide ions.
[H+] = 1 x 10-7 M
[OH-] = 1 x 10-7 M
[H+] x [OH-] = 1 x 10-14 M
Is called the
Kw = 1 x 10-14 M
If the [H+] of a solution is 1.0 x 10-5M, is the solution acidic, basic or neutral?
1.0x 10-5 M is greater than 1.0 x 10-7 M
Therefore the solution is acidic
2. [OH-] = 2.0 x 10-11
3. [OH-] = 3.5 x 10-7
Ranges from 0 -14.
0 – 6.9 = acidic
7.0 = neutral
7.1 – 14.0 = basic (alkaline)
pH = - log [H+]
That’s where they come from!
If you are given [OH-] use [H+] = 1 x 10-14
To find hydrogen ion concentration then solve for pH
pH = –log [H+]
Calculate the pH of a solution with a [OH-] of 3.5 x 10-9
2. A solution has a hydrogen ion concentration of
[H+] = 5.0 x 10 -12. Is it acidic, basic or neutral?