• Jun 6, 2026 Gravimetric Determination Of Calcium As Calcium Oxalate Monohydrate own amount of the sample containing calcium. - Dissolve the sample in dilute hydrochloric acid to convert calcium into soluble calcium chloride. - Filter the solution if necessary to remove insoluble impurities. 2. Precipitation of Calcium Oxalate - Prepare a standard oxalate By Esther Schroeder