Physical properties : Sodium dichromate  is a red or orange crystalline, chemical compound with the formula Na2Cr2O7..Usually, the salt is handled as its dehydrate form ( Na2Cr2O7 2H2O ) .It is water soluble and insoluble in alchohol. Its melting point is  357 C and boiling point is  400 C .

Chemical properties : Sodium dichromate is the basic requirement for the preparation of all chromium compounds . It forms acidic solution in water giving a PH of 4 for 1% solution . It undergoes hydration when heated at 105 C . It is a strong reducing agent and its stability is incompatible with other strong acids. This compound too holds the capacity to oxidize benzylic and allylic C-H bonds .

Synonyms : Sodium bichromate; bichromate of soda; sodium dichromate dihydrate; disodium salt of chromic acid 

Uses : Sodium dichromate is  used as an oxidizing agent in the manufacture of dyes and inks. It is also used as a corrosion inhibitors in undercoats and warmers . It act as a laboratory reagent, in the tanning of leather, and in electroplating . It act as  a mordant for acidic dyes  to improve their colour fast properties . It is also used as a Chromium source in preparing chromium compounds. It helps in cleaning metal surfaces and promotes paint adhesion . It also has many direct uses as an ingredient in the production of pigments , ceramic , textiles and metal finishing . A large quantity of sodium dichromate is also used as an anticorrosive agent for iron and preservation of wood.In the field of textile dyeing it is used as a chrome mordant  .