Abstract
The standard molar Gibbs free energy of formation of sodium chromite Δ f G m o(NaCrO 2, s, T) has been determined in the temperature range 820 to 1006 K using a solid-electrolyte galvanic cell of the type: Pt|NaCrO 2+Na 2CrO 4+Cr 2O 3 |(1−x) ZrO 2+x CaO|air|Pt where x = 0.15 and p(O 2) in air is taken to be 21.21 kPa. The measured e.m.f.s. could be represented by (E/ mV)±2.8=605.8−0.4696(T/ K) Using this equation and the reported standard molar Gibbs free energies of vormation of Na 2CrO 4 and Cr 2O 3, the standard molar Gibbs free energy of formation of NaCrO 2 was calculated and is given by Δ fG° m( NaCrO 2, s,T) ( kJ· mol −1)±2.5=−856.1+0.1693(T/K)
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