A Compendious Manual of Qualitative Chemical Analysis
A Compendious Manual of Qualitative Chemical Analysis
Eliot Charles William
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CYANIDES. 75 and hyposulphites alike ; but in the latter case a deposition of sulphur makes the liquor turbid. If only one of these gases were present, the effervescence and the odor, or the absence of odor, would identify it ; but when mixtures are to be dealt with, further means of identification are necessary. 57* Carbonates. To prove the presence of carbonic acid gas, when effervescence has occurred, add chlorhydric acid, little by little, to the effervescing solution, until the acid is dec...idedly in excess ; meanwhile keep the mouth of the test- tube loosely closed with the thumb to promote the accumula- tion of the gas evolved. When the tube is supposed to be fall, carefully decant the gas into a second test-tube contain- ing a teaspoonful of lime-water (App. , 41), taking care not to allow any of the liquid to pass over with the gas. Mix the lime-water and the gas in the second test-tube by thorough shaking. A white precipitate of carbonate of cal- cium will be produced, if the gas tested is, or contains, car- bonic acid.
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