Calcium, Bibasic Phosphate

Ca 2 H 2 P 2 O 8 + 3H 2 O. Di olve 608 grams of crystallised calcium chloride in 1000 grams of distilled water, and add gradually to this solution 1000 grams of sodium phosphate, di olved in 10,000 grams of water. Allow the precipitate to deposit, and wash it five or six times with 10 litres of water each time; drain the precipitate on a moistened cloth. As soon as its consistence permits, detach from it irregular pieces, and place them to dry in the open air upon filtering paper; the spontaneous desiccation is sufficiently rapid. From ‘Formulæ for New Medicaments adopted by the Paris Pharmaceutical Society.’