Sodium dichromate monohydrate

Abstract

When crystals of sodium dichromate dihydrate are heated at 1 atm pressure, the phase change                     Na₂Cr₂O₇,2H₂O → Na₂Cr₂O₇,H₂O + saturated solution occurs at 82.8°C with the absorption of 17.6±0.95 kJ per mole of dihydrate. A second phase change                     Na₂Cr₂O₇,H₂O → Na₂Cr₂O₇ + saturated solution occurs at 91.1°C with the absorption of a further 12.4±1.5 kJ per mole of dihydrate.