On warming citric acid with an excess of lime-water a precipitate of calcium citrate is obtained which is redissolved as the liquid cools. [Please select]
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These should be redissolved by heating before the solution is used. [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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_--Dissolve the nitrate of silver in the water as in the above, then add liquid ammonia by degrees until the mixture becomes cloudy from the precipitate of the oxide of silver, continue to add ammonia in small portions until the fluid again becomes bright from the oxide of silver being redissolved. [Please select]
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