Equations used by Calomel Potential Calculator

 

 

 

RESOURCES > REF ELECTRODES > POTENTIALS  >CALOMEL > EQUATIONS

The on-line calculator uses a cubic Taylor series to calculate the potential. The potentials are rounded to the nearest 0.1 mV.

E  = E1 - d1 * ( dT   ) - d2 * ( dT )2 - d3 * ( dT )3

E, E1 in mV, dT = T - 25 for T in �C

[KCl]

ref

E1

d1

d2

d3

0.1 M

a

+333.7

0.0875

3x10-3

--

1.0 M

a

+280.1

0.275

2.50x10-3

4x10-6

3.5 M

b

+250.0

0.4

--

--

Sat'd

a

+241.2

0.661

1.75x10-3

9.0x10-7

 

 

 


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(a) "Handbook of Analytical Chemistry", L Meites, ed., McGraw-Hill, NY, 1963. Table 5-2.The equations are given there and reproduce the values in the Table +/-0.2 mV. The data covers the range from 0�C to 70�C for cells without liquid junction. The equations for 1.0 M and Sat'd are repeated on the inside back cover of Bard.

(b) "Electrochemistry for Chemists, 2nd Ed.", DT Sawyer, A Sobkowiak, JL Roberts, Wiley, NY, 1995. Table 5.3. The data in the Table is fit exacly by the linear equation shown. The Table gives values from 10�C to 40�C for cells with liquid junction.
 

 

 

 

 

 

 

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