L23 Biophysics: Acids, Bases & Buffers

Question 1

The concentration of water in a solution is so high, it can effectively be considered as a…

Answer 1

Constant

Question 2

By ignoring [H2O], we can consider [H+] multiplied by [OH-] as being equal to a constant known as…

Answer 2

Kw

Question 3

Acids produce…

Answer 3

H+ by dissociation

Question 4

Bases produce…

Answer 4

OH- by dissociation

Question 5

10^-2 can also be written as…

Answer 5

1/100

Question 6

10^-3 can also be written as…

Answer 6

1/1000

Question 7

Log10 (X) asks…

Answer 7

10 to what power is equal to X

Question 8

Logarithms can be used to compress the…

Answer 8

Decimal scale

Question 9

Logarithmic scales are useful for measuring quantities that vary…

Answer 9

Over a huge range (such as pH)

Question 10

A weak acid will (fully dissociate / partially dissociate / not dissociate) in solution…

Answer 10

Partially dissociate

Question 11

A weak acid dissociates into…

Answer 11

H+ and conjugate base

Question 12

pKa =

Answer 12

-log Ka

Question 13

Amino acids are zwitterionic at…

Answer 13

Neutral pH

Question 14

pH defines properties of amino acids due to the…

Answer 14

Charge of side groups

Question 15

Enzyme activity varies based on pH because varying pH affects the charges of…

Answer 15

Amino acids within the protein

Question 16

A buffer can be made up from a weak acid and its…

Answer 16

Conjugate base

Question 17

A buffer stabilises pH in a buffer region near its…

Answer 17

pKa

Question 18

Which buffer system stabilises blood pH?

Answer 18

Carbonic acid/ hydrogen carbonate

Question 19

pKa of a carbonic acid/ hydrogen carbonate buffer system is…

Answer 19

6.1

Question 20

The equation: Ka = [H+] [A-] / [HA] is used to calculate…

Answer 20

The pH of a buffer