3.1.12 Acids and bases (A-level only Flashcards
(7 cards)
1
Q
why is H20 not shown in the Kw expression
A
because the concentration of H20 is almost constant
2
Q
equilibrium of KW
A
the Kw expression has an equilibrium which is endothermic to the right
3
Q
if the temperature is increased, what happens to Kw
A
the Value of KW increases
4
Q
for the pH of pure water what do you do
A
square root the KW value
5
Q
why is a pH probe washed with distilled water
A
6
Q
In buffer calc, weak acid strong base calcs, which values which
A
[A-] is the [OH-]
[HA] is the conc of the excess of the weak acid
7
Q
3 assumptions at half equivalence
A
pH= pKa
[H+]=Ka
[HA]=[A-]
