sodium oxalate (na2c2o4) is the sodium salt of oxalic acid. it is a reducing agent and is often used as a bidentate ligand.
properties
appearance: white solid
density: 2.34 g/cm³
melting point:250-270 °c (253 k)
solubility (water): 3.7 g/100 ml (20°c), insoluble in alcohol
waste disposal
after neutralization, dilute with large amounts of water and discharge
purpose
it can be used as the reference substance for calibrating potassium permanganate solution during redox titration.
ca2+ can be removed, which can be used to test hard water or biologically prevent coagulation (by removing calcium ions from the plasma to prevent the biochemical pathways that cause coagulation). it should be noted that removing ca2+ will also affect brain function, and it will cause calcium oxalate to accumulate in the kidneys, causing kidney stones.