BMS02-1048 Electrochemical Equilibria

Question 1

Which 2 forces act on ions?

Answer 1

Concentration gradient and electrical gradient, sometimes there are balanced so the con pushing K out is the same as the force pulling K in

Question 2

How can the equilibrium potential be found?

Answer 2

From the Nernst equation if the conc grad value is known

Question 3

Nernst equation

Answer 3

E = RT/zF x ln (Conc out/Conc in)

Question 4

E

Answer 4

Equilibrium potential for the ion

Question 5

R

Answer 5

Universal gas constant

Question 6

Z

Answer 6

Valency (charge) on ion

Question 7

F

Answer 7

Faradays constant

Question 8

What is the concentration gradient?

Answer 8

Store of potential energy to perform osmotic work

Question 9

How to calculate the gradient?

Answer 9

Conc out/Conc in

Question 10

What does osmotic potential depend on?

Answer 10

Number particles in solution and their kinetic energy

Question 11

Osmotic work is stored as…

Answer 11

Potential energy by the concentration gradient

Question 12

Osmotic work=

Answer 12

RT x ln (Conc out/Conc in)

Question 13

Voltage is…

Answer 13

Measure of the work done in separating the ions

Question 14

What is the unit of charge?

Answer 14

Coulomb

Question 15

Electrical potential difference between 2 points is…

Answer 15

Work that must be done to move one coulomb of charge from one point to another

Question 16

Voltage =

Answer 16

Joule / Charge

Question 17

What is potential energy of charge?

Answer 17

1 volt when 1 joule of work is done moving 1 coulomb between 2 points

Question 18

What are the units of electrical and osmotic work?

Answer 18

Joules/mole

Question 19

Z =

Answer 19

Valency

Question 20

How to calculate how many coulombs of charge 1 mole of ion can carry?

Answer 20

Valency x Faradays constant

Question 21

Electrical work=

Answer 21

Potential difference (E) x Valency (z) x F

Question 22

How is the Nernst equation written for monovalent ions?

Answer 22

E = 58 x log (Conc out/Conc in)

Question 23

What are the units for RxT/zxF?

Answer 23

Joules per coulomb so its expressed in volts

Question 24

Patch clamping

Answer 24

Electrode sealed to cell surface

Question 25

What is used to record voltage?

Answer 25

Fluid filled glass capillary tube microelectrode

Question 26

Compare inside and outside recordings

Answer 26

Same shape but the outside is less of a strong wave