Calomel Potential, Equations


		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 ºC

[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 0ºC to 70ºC 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 10ºC to 40ºC for cells with liquid junction.


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Equations used by Calomel Potential Calculator