The most important tungstate is the so-called tungstate of soda, which is sodium paratungstate, NaloW12041.28H20.
A blue bronze, Na2W5015, forming dark blue cubes with a red reflex, is obtained by electrolysing fused sodium paratungstate; a purple-red variety, Na2W309, and a reddish yellow form result when sodium carbonate and sodium tungstate are heated respectively with tungsten trioxide and tinfoil.
- The sodium salt, NaW0 4 H 2 O, is obtained by evaporating in a vacuum the product of boiling a solution of sodium paratungstate with hydrogen peroxide.
How would you define paratungstate? Add your definition here.