The liquor is poured off into a warm
strong solution of ammonium carbonate. Ferric hydrate and alumina will
be precipitated. They are filtered off, re-dissolved, and again
precipitated in ammonic carbonate solution; the combined filtrates are
boiled for some time, and acidified slightly with hydrochloric acid. The
carbon dioxide is boiled off, and the beryllia is then precipitated as
hydrate with ammonia. The hydrate is washed with hot water, dried,
ignited, and weighed as beryllia, BeO.
Beryllia has a specific gravity of 3.08. It is white, infusible, and
insoluble in water. After ignition, it is insoluble in acids, except
sulphuric, but is rendered soluble by fusion with alkalies.
Beryllia, in a solution of carbonate of ammonia, is precipitated as
carbonate on boiling in proportion as the carbonate of ammonia is
volatilised. The hydrate is dissolved by a boiling solution of ammonic
chloride, ammonia being evolved.
THE ALKALINE EARTHS.
LIME.
Lime is an oxide of calcium, CaO. It occurs abundantly in nature, but
only in a state of combination. The carbonate (CaCO_{3}), found as
limestone, chalk, and other rocks, and as the minerals calcite and
arragonite, is the most commonly occurring compound. The hydrated
sulphate, gypsum (CaSO_{4}.2H_{2}O), is common, and is used in making
"plaster of Paris.
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