Abstract
The standard potentials of the barium amalgam electrode have been determined over the temperature range 283.15 to 343.15 K from e.m.f. measurements of the cell: Pt|xBa+(1−x) Hg|BaCl 2( aq,x)Agcl| AgPt The results can be reproduced accurately by the equation: E °/V = −1.160117−2.765854×10 −3( T K )+3.025048×10 −6( T K ) 2 The standard thermodynamic functions at 298.15 K for the barium amalgam and for the barium amalgamation reaction have also been obtained. In addition, the activity coefficients of aqueous BaCl 2 have been determined at molalities up to 0·3 mol kg −1 over the temperature range 283.15 to 343.15 K. The logarithm of the rational activity coefficient of barium in dilute amalgams is a linear function of the mole fraction of barium: log 10 f Ba = Qx Ba, where Q is temperature-dependent and can be represented by the equation: Q=767.43-4.1793( T K )+0.0060068( T K ) 2
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