Question

Convert each of the potentials. The silver-silver chloride and calomel reference electrodes are saturated with KCl, resulting in cell potentials of +0.197 V and +0.241 V with respect to the standard hydrogen electrode (S.H.E.), respectively If an electrode has a potential of 0.695 V with respect to a standard hydrogen electrode (S.H.E.), what is the potential with respect to a silver-silver chloride electrode? E= V If an electrode has a potential of-0.131 V with respect to a silver-silver chloride electrode, what is the potential with respect to a S.H.E.? E V If an electrode has a potential of-0.105 V with respect to a saturated calomel electrode (S.C.E.), what is the potential with respect to a S.H.E. E If an electrode has a potential of 0.002 V with respect to a silver silver chloride electrode, what is the potential with respect to a S.C.E.? E V If an electrode has a potential of-0.006 V with respect to a S.C.B, what is the potential with respect to a sliver silver chloride electrode? E- V

Answer 1

1.

An unknown electrode has a potential of 0.695 V with respect to S.H.E.

i.e.

Eunknown/SHE+0.695 V

We know that Ag-AgCl electrode has a potential of +0.197 V with respect to S.H.E

EAg-AgCi/SHE =+0.197 V

Hence, the unknown electrode with respect to Ag-AgCl must be

Eunknown/Ag-Agc= Eunknown/SHE EAg-AgCl/SHE Eunknown/Ag-AgC = +0.695 V - 0.197 V +0.498 V

Hence, the answer is +0.498 V

2.

An unknown electrode has a potential of -0.131 V with respect to Ag-AgCl

i.e.

Eunk nown/Aq-AgCl=-0.131 V

We know that Ag-AgCl electrode has a potential of +0.197 V with respect to S.H.E

EAg-AgCi/SHE =+0.197 V

Hence, the unknown electrode with respect to SHE can be calculated as m

Eunknown/Ag-AgCl Eunknown/SHE EAg-AgCl/SHE 0.131 V Eunknoun/SHE 0.197 V Eunknown/SHE =-0.131 V 0.197 V +0.066 V

Hence, the answer is +0.066 V.

3.

An unknown electrode has a potential of -0.105 V with respect to S.C.E

Eunknown/SCE=-0.105 V

We know that SCE electrode has a potential of +0.241 V with respect to SHE

ESCE/SHE= +0.241

Hence, the unknown electrode potential with respect to SHE is

Eunknown/SCE Eunknown/SHE ESCE/SHE 0.105 V Eunknoun/SHE 0.241 V Eunknown/SHE =-0.105 V0.241 V 0.136 V

Hence, the answer is +0.136 V.

4.

An unknown electrode has a potential of 0.002 V with respect to Ag-AgCl electrode.

= 0.002 V Eunknown/Ag-AgCl

Hence, its potential with respect to SHE is

Eunknown/Ag-AgCl Eunknown/SHE EAg-AgCl/SHE +0.002 V Eunknown/SHE 0.197 V Eunknown/SHE +0.002 V 0.197 V 0.199 V

Now, the same electrode has a potential of 0.199 V with respect to SHE.

Hence, its potential with respect to SCE can be calculated as follows

$E_{unknown/SCE}=E_{unknown/SHE}-E_{SCE/SHE} \\ \Rightarrow E_{unknown/SCE}=+0.199 \ V - 0.241 \ V = -0.042 \ V$

Hence, the answer is -0.042 V.

5.

An unknown electrode has a potential of -0.006 V with respect to S.C.E

We know that SCE electrode has a potential of +0.241 V with respect to SHE

ESCE/SHE= +0.241

Hence, the unknown electrode potential with respect to SHE is

Eunknown/SCE Eunknown/SHE ESCE/SHE 0.006 V Eunknoun/SHE 0.241 V Eunknown/SHE -0.006 V 0.241 V 0.235 V

Hence, the unknown electrode potential with respect to Ag-AgCl can be calculated as

$E_{unknown/Ag-AgCl}=E_{unknown/SHE}-E_{Ag-AgCl/SHE} \\ \Rightarrow E_{unknown/Ag-AgCl}= +0.235 \ V - 0.197 \ V = +0.038 \ V$

Hence, the answer is +0.038 V