APPARENT MOLAR VOLUMES OF ORGANIC-ACIDS AND SALTS IN WATER AT 298.15 K

Apparent molar volumes of citric, oxalic and lactic acids and di-sodium hydrogen citrate, tri-sodium citrate, tri-potassium citrate, sodium hydrogen tartrate, di-sodium tartrate, potassium tartrate, ammonium tartrate, dl-di-sodium malate, di-sodium maleate, di-sodium oxalate and sodium lactate were determined in aqueous solutions at 298.15 K. For these organic acids and salts the partial molar volumes at infinite dilution and the conventional partial molar volumes of single-, double- and triple-charged ions were derived or estimated. It was observed that in ternary system the Young rule for the mean apparent molar volumes can be applied to citric acid-potassium chloride solutions but not to citric acid-tri-sodium citrate solutions. © 1990.