When heated they liquefy; and if the heating be continued, the water of crystallization is driven off, the salt froths and^swells, and at last an amorphous powder remains. [Please select]
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His mouth froths, and the froth is the word. [Please select]
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It soon begins to evolve gas and the mixture froths. [Please select]
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The latter is preferable, as the former is liable to give a developing bath that froths in working, especially if much acid has been left in the cotton from the diazotising bath. [Please select]
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