Diarsenate

Arsenite of silver affords a fine yellow colour. Salts which contain arsenic acid are termed arsenates. The arsenate of ammonia forms large rhombic crystals which may easily be converted into octahedral crystals of diarsenate of ammonia.

With an increase in the arsenic content in the system, sodium arsenate, magnesium diarsenate, and, finally, iron diarsenate are formed in that order. Hence, the investigated arsenates can be arranged in the following sequence [...]