8.3 Flashcards
1
Q
scale of pH
A
0-14
2
Q
how is pH calculated
A
pH = -log [H+]
[H+] = 10^ -pH
- same with pOH only instead oh [H+] we have [OH-]
3
Q
pH + pOH =
A
14
4
Q
what kind of relationship do we have between pH and [H+]
A
Inversely proportional
increasing pH by 1 uit = decreasig [H+] 10 times and vice versa
5
Q
how can pH be measured?
A
- using an universal indicator paper/solution
- pH meter or probe that directly read the [H+]
pH meters can record an accuracy of several decimal points.
pH meters must be calibrated with a buffer solution and standardized for the temperature.
6
Q
what is Kw
A
Kw = [H+] [OH-] = 1.00 * 10^ -14
it is a constant
can be used to find concentrations
7
Q
solutions and their ph
A
Acidic solutions [H+] > [OH-] ph<7
Neutral solutions [H+] = [OH-] ph=7
Alkaline solutions [H+] < [OH-] ph>7
8
Q
what kind of relationship is between [H+] and [OH-]
A
inversly proportional in an aqueous solution
