Solubilities of Sodium Gluconate in Water and in Aqueous Solutions of Ethanol and Methanol

The solubility of sodium gluconate in water and in aqueous ethanol and methanol solutions was measured, over the temperature range 10 °C to 50 °C. The measurements were performed with ethanol solutions of (0 to 1.2) g of ethanol/g of water and with methanol solutions of (0 to 1.4) g of methanol/g of water. An equation was derived to calculate the solubility as a function of temperature and alcohol concentration, with the maximum relative deviation between experimental and calculated solubility values < 4% (≅0.0035 g of sodium gluconate/g of water) for both ethanol and methanol systems.