Abstract The precipitation of a number of elements with ammonium benzoate has been investigated. Conditions have been described for the quantitative precipitation and subsequent estimation by ignition to the oxide of stannic tin, titanium, zirconium and thorium. Bismuth is quantitatively precipitated with benzoate but owing to the subsequent difficulty of estimating the amount of bismuth in the precipitate the method can only be recommended where an electrolytic finish can be employed. Ceric cerium cannot be satisfactorily estimated with benzoate as reduction to cerous always occurs. By control of the pH and by using thioglycollic acid as a complex-forming or reducing agent or salicylic acid as a complex-forming agent, a number of estimations have been suggested in the presence of otherwise interfering elements. Similarly separations of those elements giving precipitates with ammonium benzoate from some of those elements not precipitating have been described. Further detailed study of the value of ammonium benzoate in effecting quantitative separations of elements appears desirable.