EXP349

=Researcher= Unnati Hajari =Objective= Purify caffeine through recrystallization with 10% impurities using 1-octanol and washing with pentane. **[be more specific JCB]** =Procedure= 0.25 =Results= =Discussion= =Conclusion=
 * [add to Reaction Attempts JCB]**
 * [link to calculation sheet JCB]**
 * [report recovered mass and apparent recovery yield JCB]**
 * [when do you plan to measure the purity? JCB]**
 * [compare to other experiments from our group attempting to purify from recrystallization JCB]**
 * [What can you conclude thus far? JCB]**

=Log= 10:48- Weighed test tube **[what kind? JCB]**, without cap (9.912g). Added 0.25g of caffeine and 0.025g of cinnamic acid. Added 1.253g of 1-octanol. 11:10- Heated using #|heat gun **[how? JCB]** for 2-3 minutes. **[what did you observe - and when? JCB]**n 11:23- Cooled in ice bath. **[what was the appearance of the sample? JCB]** 11:31- Weigh empty Sinterglass funnel (16.493g). **[spelling JCB]** 11:43- Weighed #|Erlenmeyer flask (116.963g). 11:45- Started vacuum #|filtration. **[what did the sample look like? was it still in ice? JCB]** 11:59- Weighed Sinterglass funnel after filtration (16.8245g). Weighed #|Erlenmeyer flask containing filtrate (117.986g). 12:06- 1.3223g of 1-octanol wash and then another 1.2515g wash of 1-octanol. 12:20- 3 washes of crystals with n-pentane with vacuum #|filtration. 12:24- 1 more wash with n-pentane without vacuum filtration. **[why did you not use vacuum filtration? JCB]** 12:32- Weighed Sinterglass (16.7087g)
 * [missing date JCB]**