. Practical methods of organic chemistry . 6 GENERAL PART is made of rapid-filtering paper (Fig. 2). The solution to befiltered is not allowed to cool before filtering, but is poured onthe filter immediately after removing it from theflame or water-bath. If inflammable solventsare used, care must be taken that the vapoursare not ignited by a neighbouring flame. Undernormal conditions, no crystals or only a fewshould separate out on the filter during filtra-tion. If large quantities of crystals appear in asolution as soon as it is poured on the filter, it isan indication that too small an amoun
. Practical methods of organic chemistry . 6 GENERAL PART is made of rapid-filtering paper (Fig. 2). The solution to befiltered is not allowed to cool before filtering, but is poured onthe filter immediately after removing it from theflame or water-bath. If inflammable solventsare used, care must be taken that the vapoursare not ignited by a neighbouring flame. Undernormal conditions, no crystals or only a fewshould separate out on the filter during filtra-tion. If large quantities of crystals appear in asolution as soon as it is poured on the filter, it isan indication that too small an amount of the solvent has beenused. In a case of this kind, the point of the filter is pierced andthe crystals are washed into the unfiltered portion of the solutionwith a fresh quantity of the solvent; the solution is further dilutedwith the solvent, heated, and filtered. Very difficultly soluble compounds crystallise during the filtra-tion in the space between the filter and funnel, in consequenceof the contact of the solution with the cold
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