CHEM 191 Lecture 17

Question 1

what is the equation for E0reaction

Answer 1

E0reaction = (RT/nF)lnK

Question 2

what are standard conditions

Answer 2

1 mol per litre concentrations and 1 bar pressure

Question 3

what are the steps for balancing redox equations

Answer 3

balance for non-oxygen and hydrogens first
balance oxygens by adding water
balance hydrogens by adding H+ ions
balance charges by adding electrons

Question 4

reduction potentials involving more complex ions often depend on _____

Answer 4

pH

Question 5

what is the biological standard state, E0’

Answer 5

all species at 1 mol per litre concentrations EXCEPT H+ which has a concentration of of 1x10^-1 mols per litre (pH=7) - a realistic biological value

Question 6

what is a pH meter

Answer 6

an ion selective electrode - one that is able to measure [H+] as low as 1x10^-14

Question 7

the difference in [H+] from inside the pH meters electrode to that outside produces a ______ across the glass membrane proportional to the ____ in the sample solution

Answer 7

potential - [H+]

Question 8

what are concentration cells

Answer 8

a type of galvanic cell in which both side of the cell contain the same ions but at different concentrations

Question 9

will we see a flow of electrons in concentration cells

Answer 9

yes