| Barium Tetramolybdate, Barium Metamolybdate, BaMo4O13.5H2O or Ba3H4[H2(Mo2O7)6].12H2O, is precipitated when a solution containing barium chloride and sodium octamolybdate is warmed, or when barium octamolybdate is treated with hot water. On heating to 120° C. the compound loses four-fifths of the water present, which corresponds to the 12H2O in the above constitutional formula. The addition of barium chloride to a solution of sodium tetramolybdate yields the hydrate 2BaMo4O13.7H2O. |