pH, acids and bases Flashcards
week 2
1
Q
define pH
A
-log10[H+]
2
Q
define acidosis
A
pH is less than 7.35
3
Q
define alkalosis
A
pH is more than 7.45
4
Q
what is the normal range for physiological pH in the body?
A
7.35 - 7.45
5
Q
define acid
A
molecules that tend to release protons
6
Q
define base
A
molecules that accept protons
7
Q
an acid is a proton …
A
donor
8
Q
a base is a proton …
A
acceptor
9
Q
define conjugate base
A
chemical formed upon ionisation of an acid
10
Q
define conjugate acid
A
acid formed when a base and proton binds
11
Q
the larger Ka is, the … the acid
A
stronger
12
Q
the smaller pKa is, the … the acid
A
stronger
13
Q
define pKa
A
the pH at which the acid is half dissociated into H+ and A-
14
Q
define buffer
A
a substance that resists pH change on addition of acid or base
15
Q
when do acids or bases act as buffers?
A
when the pH is close to their pKa (+/- 1 pH unit)
