Write equations to represent the reactions involved in the preparation of barium chloride from heavy spar.
Sulphites give with barium chloride a precipitate soluble in hydrochloric acid.
The gelatine is allowed to swell in the water, and, by the aid of heat, is dissolved; the barium chloride is then added.
Black soluble prisms, formed by decomposing silver permanganate by means of barium chloride, and cautiously evaporating.
To the filtrate ammonia is added, and then barium chloride, which precipitates the sulphur as barium sulphate.
barium chloride renders the recovery incomplete: but tetanisation temporarily removes the induced sluggishness.
It should not be precipitated by barium chloride, and especially by soluble sulphates.
Preparation: 100 grams of barium chloride are dissolved in one liter of distilled water and filtered.
Caffein aids the action of nitrates, acetanilid, ethyl alcohol and amyl alcohol, and increases the toxicity of barium chloride.
If sulphuric acid is present it must be separated by treating the solution of the compound with barium chloride and filtering.