One class, represented by gelatin, will redissolve on warming or diluting, while the other class, containing such substances as silica, albumen, and metallic, hydrosulphides, will solidify on heating or on the addition of electrolytes to form a solid "gel" which cannot be redissolved. [Please select]
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A precipitate thrown down by boiling and redissolved by nitric acid is probably phosphate of lime. [Please select]
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These should be redissolved by heating before the solution is used. [Please select]
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--Saturated solution of sulphate of copper; to this add ammonia enough to precipitate the oxide of copper and redissolve it (as with the silver in the above), producing the azure liquid. [Please select]
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