Above this temperature the anhydrous salt is the stable solid phase.
When perfectly pure and anhydrous, it forms a white and highly crystalline mass, rapidly decomposed by air and moisture.
By careful 188 heating it may be made to yield the anhydrous salt.
A salt hydrate on being heated dissociates into a lower hydrate (or anhydrous salt) and water vapour.
The characteristic rock is a black vitreous trachyte resembling pitchstone, but anhydrous.
The numbers denote grams of sodium sulphate, calculated as anhydrous salt, dissolved by 100 grams of water.
By dissolving it in concentrated sulphuric acid and warming the solution, the anhydrous salt is obtained.
Similarly, the solubility curve of anhydrous sodium sulphate has been followed to temperatures below 32.5.
Louyet has shown that the liquid acid, obtained as above, is not (as once believed) anhydrous.
If the double salt is anhydrous, the point S lies at infinity, and the lines ef and gh are parallel to each other.
anhydrous an·hy·drous (ān-hī'drəs)
Without water, especially water of crystallization.