Unstable white large flaky or needle-like crystals. It is easy to absorb moisture and is easily soluble in water. When the concentration is 100%, 10%, 20%, 30%, 40% and 50%, the relative densities of the aqueous solution are: 1.2040, 1.019Chemicalbook2, 1.0410, 1.0637, 1.0875, 1.1122. The product decomposes in hot water and is slightly soluble in ether, benzene, carbon disulfide, chloroform. Melting point 32.05 °c, boiling point 70 °C (1.33 kPa).