What volume (mLs) of 95 degree water is needed to dissolve 10 grams of benzoic a
ID: 486270 • Letter: W
Question
What volume (mLs) of 95 degree water is needed to dissolve 10 grams of benzoic acid? (Use solubility in text). If this solution is cooled to 10 degree c and recrystallized, how many grams of benzoic acid will crystallize? What Is the maximum percent recovery? How is activated carbon used in the recrystallizing process? Why should a large excess of activated carbon be avoided? Under what circumstances is a miscible solvent mixture more effective than a single solvent in the recrystallization process?Explanation / Answer
4) Activated charcoal is a good absorbent. Activated charcoal is carbon that is treated with oygen, leaving the carbon in a highly porous state. Crystallisation can remove impurities from the solution but it doesn't remove all of the impurities, the charcoal removes the impurities during crystallisation so that the crystals forming are as pure as possible.
5) Dissolve your compound in a small amount of the soluble solvent heated to its boiling point. Then add insoluble solvent slowly while keeping the solution hot, until you see your solution start to get turbid. Then you add a drop more of your soluble solvent to make it all clear again,and let it cool slowly. If you are lucky, you will found the perfect solvent for growing nice large crystals of your compound.
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