Used primarily in analytical chemistry as a reagent for determining calcium levels in various substances by forming an insoluble calcium oxalate precipitate, aiding in quantitative analysis. It also serves as a reducing agent in certain chemical reactions and is employed in the preparation of other oxalate compounds or as a starting material in synthesis. In histology, it is utilized as a fixative for preserving tissue samples and in decalcification processes. In the leather industry, it helps in removing calcium hardness from water, facilitating bleaching and softening of hides. Additionally, it finds application in the textile industry for dyeing processes and as a mordant to improve color fastness. In laboratories, it can be used to prepare buffer solutions.