Abstract
Although it is assumed that only compounds of carbon are being analyzed and hence a test for carbon is more or less superfluous, there may be instances when such a test is advisable or desirable. The ignition test (page 27) will, in the majority of cases, give evidence of the presence of carbon but there will be exceptions. Volatile substances simply evaporate or sublime and some non-volatile substances do not char. For example, metallic salts of organic acids will not necessarily show the presence of carbon when subjected to the ignition test. They may appear to decompose but purely inorganic substances may also decompose when heated. Furthermore, some inorganic compounds such as the nitrates of some of the heavy metals will decompose when heated and leave a residue of a black oxide which might be mistaken for carbon. In doubtful cases, therefore, a test for carbon should be carried out.
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Schneider, F.L. (1964). Elementary Analysis. In: Qualitative Organic Microanalysis. Monographien aus dem Gebiete der Qualitativen Mikroanalyse, vol 2. Springer, Vienna. https://doi.org/10.1007/978-3-7091-5827-2_4
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DOI: https://doi.org/10.1007/978-3-7091-5827-2_4
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