Sodium antimonate

This substance is precipitated by the interaction of potassium antimonate and a concentrated solution of a sodium salt, its formation affording a means of testing for sodium. The white, amorphous salt may be regarded as the hydrated meta-antimonate, NaSbO₃,3½H₂O; or, since one molecule of water is expelled above 200° C., it may be considered a pyroantimonate, Na₂H₂Sb₂O₇,6H₂O. Its heat of formation from the elements is 346.4 Cal.