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As these corks always contain appreciable quantities of water, which is exuded when the cork comes into contact with a hot liquid. Rubber stoppers should therefore be used in these circumstances. When boring rubber stoppers, lubricate the borer well, either with aqueous glycerine or with vaseline. Then clean well and dry before using. Storage of Specimens. Solid compounds after purification should be stored in bottles or in corked specimen tubes, according * For most purposes, the use of corks is now replaced by that of groundglass apparatus (p.

It follows that the prime factor which determines the efficiency of a column is the extent to which the vapour is " scrubbed " by the condensate, and columns are therefore designed to make this "scrubbing" as intimate as possible. Text-books of theoretical organic chemistry frequently illustrate remarkable and weird types of fractionating column which the practical chemist never encounters. For actual use in the laboratory two types of column are recommended. (A) For quick rough separations, or (more particularly) for the separation of two components having a considerable difference in boiling-point, the pear column (Fig.

The tube leading from E to the receiver F is double-walled: the inner tube gives direct access from C through the tap E to the receiver F, while the outer (annular) tube provides access from F through the small holes H to the side-arm JJ' carrying the three-way tap G. G is made to give either direct access through the tube JJ', or access from the outside through J downwards to F, or from the outside through J' to the manometer and pump. The triangle is then connected to the manometer (fitted in a "side-chain'* as before) and through the trap K (a Buchner flask) to the pump.

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