... ; readily soluble in water or glycerin, almost in 1,Formula: C6H5K3O7·H2O2,Formula wt: 324.413,CAS: [6100-05-6]4,Specificity ... (ii)DescriptionWhite, hygroscopic, granular powder or transparent crystalsIdentificationPositive tests for citrate and for potassiumAppearance of solutionClear and colourless--Assay(on anhydrous basis ... .0Arsenic(As),≤ppm--1Lead(Pb),≤ppm--1Mercury(Hg),≤ppm--1 potassium citrate