Calcium, Phosphate of

Syn. Calcis phosphas (Ph. B.). Digest bone-ash, 4 oz. , in hydrochloric acid, 6 fl. oz. , diluted with a pint of water, until it is di olved. Filter the solution, if nece ary; add water, 1 pint, and afterwards solution of ammonia (Ph. B.), 12 fl. oz. , or a sufficient quantity, until the mixture acquires an alkaline reaction, and having collected the precipitate on a calico filter, wash it with boiling distilled water as long as the liquid which pa es through occasions a precipitate when dropped into solution of nitrate of silver acidulated with nitric acid. Dry the washed product at a temperature not exceeding 212° F.