Assertion: cryolite | /r/HasProperty | formed with a yield of 97 to 99 percent
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Source sentences:
text: It is surprising and unexpected that by simultaneous addition of a sodium salt solution and an ammonium fluoride solution, cryolite is formed with a yield of 97 to 99 percent relative to the initially employed aluminum fluoride and fluorine and with a degree of purity between 98 and 99 percent.