pH

Question 0

If the pH in the blood is too low, what symptoms occur?

Answer 0

Hyperventilation

Question 1

What is the term If the pH in the bloodstream is too high and what are the symptoms?

Answer 1

Alkalosis, leads to shallow breathing

Question 2

What is the average charge on a weak acid at its pKa?

Answer 2

-0.5

Question 3

At what point is a buffer at its most effective?

Answer 3

Around its pKa

Question 4

What are indicator dyes made from?

Answer 4

Weak acids and conjugate bases, where they are different colours

Question 5

What indicator varies between Yellow at low pH, green at pH 7.1, and blue at high pH?

Answer 5

Bromothymol blue

Question 6

Delta G = (related to Ke)

Answer 6

delta G = -RT ln(Ke)

Question 7

If Ke is bigger than 1 which side will the position of equilibrium be?

Answer 7

Right hand side, favours products

Question 8

1Calorie =

Answer 8

4218J

Question 9

What pH range does the citrate buffer go between?

Answer 9

2 - 6

Question 10

What does Delta G0’ stand for?

Answer 10

0 = standard conditions
' = at pH 7

Question 11

What does Eh stand for?

Answer 11

Redox potential, E’0/Em7 used for redox potential at pH7

Question 12

A more negative electrode potential means a…

Better reductant OR better oxidant

Answer 12

Better reductant

Question 13

More positive electrode potential =

Answer 13

A better oxidant

Question 14

Delta G0 = (related to potential)

Answer 14

Delta G0 = -n.f.

Question 15

What is a SHE?

Answer 15

Standard hydrogen electrode

Question 16

Eh = ….

Answer 16

The actual potential

Question 17

What makes up a pH meter?

Answer 17

silver chloride electrode, saturated KCl solution, thing glass wall doped with lithium ions

Question 18

What is the Nernst equation?

Answer 18

Eh = Em + (RT/nF).ln([oxidised][reduced])

Eh = actual potential
Em = standard potential

Question 19

Eh = Em + (RT/nF).ln([oxidised]/[reduced])

What is the name of this equation?

Answer 19

Nernst equation

Question 20

In a pH meter what is proportional to pH of solution?

Answer 20

The potential difference across the membrane is proportional to pH of solution

Question 21

What pH range does a succinate buffer cover?

Answer 21

3 - 6.5

Question 22

What pH range does a phosphate buffer cover?

Answer 22

1 - 3 & 6 - 8

Question 23

What is the Henderson-Hasselbach equation?

Answer 23

pH = pKa + log([A-]/[HA])