Organic 2 Review Problem 20

Organic 2 Review Problem 20 - 4 PRACTICAL ORGANIC CHEMISTRY...

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4 PRACTICAL ORGANIC CHEMISTRY is almost non-inflammable, and therefore should the flask break whilst still over the flame, the oil seldom ignites, ( c ) the oil is non-corrosive, and owing to its low specific heat causes remark- ably slight burns even if spilt, while at a high temperature, on the hands. The oil may be safely heated up to about 220°, when it begins to decompose slightly, giving off smoky fumes. For substances melting above this temperature, the flask D should contain concentrated sulphuric acid containing a crystal of potassium nitrate to prevent charring and consequent darkening in colour at higher temperatures. Fresh sulphuric acid can be safely heated to about 280°, but its use should generally be avoided in elementary classes. Alternatively, silicone* can be used in place of sulphuric acid for compounds of high melting- point. It is a straw-coloured non-corrosive liquid which can be safely heated to ca. 300° without decomposition or ignition. The capillary tube is then placed as shown against the ther-
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This note was uploaded on 09/19/2011 for the course CHM 2211 taught by Professor Castalleano during the Fall '06 term at University of Florida.

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