Water absorber used in combustion analysis is___________________?
Correct answer: D. Mg (CIO4)2
- A. 50% KOH
- B. Lime water
- C. CaCl2
- D. Mg (CIO4)2
Explanation
Anhydrous magnesium perchlorate, Mg(ClO4)2, absorbs the water formed when an organic compound is burned, allowing the hydrogen content to be determined. Calcium chloride can also absorb water in some applications, but magnesium perchlorate is the standard efficient water absorber in combustion analysis. The likely mistake is choosing CaCl2 because it is a familiar drying agent without considering the specific analytical method.
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About Classification of Organic Compounds
Organic compounds are classified by carbon skeleton into open-chain, branched-chain and cyclic compounds, including homocyclic and heterocyclic types. The classification also uses functional groups to distinguish hydrocarbons, halo compounds, alcohols, aldehydes, ketones, carboxylic acids and their derivatives, which is different from naming compounds by IUPAC rules.
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