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kfwangguan

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ÎÒÃǶ¼ÖªµÀÒ»°ã¾§ÌåµÄÉú³¤·½·¨ÓÐÖîÈç solvent evaporation£¬solution diffusion£¬hydrothermal conditions µÈµÈ£¬µ«ÊÇÎÒ¿´µÄÕâ¸öÎÄÏ×ÉÏÃæËµµÄºÏ³É·½·¨ÀïÓÐrotorary evaporator »¹ÓÐ centrifugation ʲôµÄ£¬ÀïÃæ¼ÓÈëÓлúÈܼÁ·ÖÀë³ÁµíµÄ²½ÖèÓÖÏñÊÇ decantation . ×îºó³¤³ö¾§ÌåÄÇÒ»²½ËµµÄÒ²²»Ïêϸ ²»ÖªµÀʲô³¤³öÀ´µÄ¡£Èç¹û¹éÄÉËûµÄºÏ³É·½·¨ÊDz»ÊÇÓ¦¸Ã½Ð×ösolvent evaporation ÄØ£¿Èç¹û²»ÊÇÄÇÓ¦¸Ã½Ð×öʲô£¿

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A mixture of a and b in 9 mL of water was refluxed for 45 min, after which the

volume of the solution was reduced to half on a rotorary evaporator. Addition of 5

mL of ethanol to the solution led to the formation of an orange precipitate of c,

which was separated by filtration. Addition of a few drops of ethanol to the

filtrate led to the formation of a fine yellow-orange powder, which was identified

as a mixture of compounds and was separated after centrifugation. In the resulting

solution, pale-yellow needle crystals of d appeared in a few hours.

[ Last edited by kfwangguan on 2010-8-24 at 13:14 ]
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kfwangguan

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daun

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kfwangguan(½ð±Ò+1):лл 2010-08-24 18:40:05
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Originally posted by daun at 2010-08-24 15:57:08:
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wsht212:лл½»Á÷£¬Ï£Íû³£À´£¡ 2010-08-25 20:04:35
just the most traditional way to evapourize solvent and add
a poor solvent
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