Flashcards in 8.4 pH Deck (12)
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1
What is the equation for pH?
-log10[H+(aq)]
2
What are the units for pH?
pH has no units.
3
What is the equation for finding the concentration of hydrogen ions?
[H+(aq)] = 10^(-pH)
4
What happens to the concentration of H+ ions when the pH increases by one unit?
A 10 fold decrease in the H+ concentration is required to increase the pH by one unit - every time a solution of strong acid is diluted by a factor of 10 the pH goes up by 1 unit.
5
How does water dissociate?
H2O (l) H+ (aq) + OH- (aq)
6
What is the equilibrium constant for the dislocation of water?
Kw = [H+(aq)][OH-(aq)]
7
Why is the concentration of water not included in the expression for Kw?
Because it is the solvent and its concentration is essentially constant.
8
What is Kw known as and what is its value?
The ionic products constant for water and has a value of 1.0x10^-14 at 25 degrees Celsius.
9
In any aqueous solution at 25 degrees celsius what is equal to 1.0x10^-14?
The product of H+ concentration and OH- concentration is 1.0x10^-14
10
When is the only time [H+] equals [OH-]?
In a neutral solution or in pure water.
11
What is the concentration of H+ ions compared to OH- in an acidic solution?
[H+] > [OH-]
12
