arium propionate, may contain barium acetate,
barium butyrate. barium formate, barium benzoate.
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1. Evaporate to dryness. 1. Evaporate off alcohol and
dissolve up the residue on
2. Dissolve residue in 150 the filter in hot water and
c.c. water. neutralise.

3. Acidify with phosphoric 2. Divide the solution into
acid and distil. four portions:

4. Saturate distillate with (a) Add ferric chloride solution.
calcium chloride and distill
over a few c.c. ~Brown~ colour = _acetic_ or
_formic_ acids.
5. Test distillate for butyric
acid: ~Buff ppt.~ = _benzoic_ acid
(see ether soluble acids).
Add 3 c.c. alcohol and 4 drops
concentrated sulphuric acid. (b) Add silver nitrate
solution; then add one drop
~Smell of pineapple~ = _butyric_ ammonia water, and boil.
acid.
~Black~ precipitate of metallic
Propionic acid in small silver = _formic_ acid.
quantities cannot be
distinguished from butyric (c) Evaporate to dryness; mix
acid by tests within the with equal quantity of
scope of the bacteriological arsenious oxide and heat
laboratory. on platinum foil.

Unpleasant ~smell of cacodyl~
= _acetic_ acid.

(d) Add a few drops of
mercuric chloride solution
in test-tube, and heat to
70 deg. C.

~Precipitate~ of mercurous
chloride which is slowly
reduced to mercury =
_formic_ acid.

8. If the distillation of "B" is continued as l