7/24/2019 Unknown Analysis

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DUMAGPI, Eunice Ruth A.2012-24604

I started with the metin! "#int determinati#n $#r m% un&n#wn ana%sis,t#!ether with m% #ther cassmates wh# were as# assi!ned t# d# the metin! "#intdeterminati#n 'rst. (e !#t #ur 'rst resut #n% t# 'nd #ut that the therm#meter was

n#t $uncti#nin! we. (e a !#t #ur metin! "#int wr#n!. (e chan!ed thetherm#meter and 'na%, we !#t the ri!ht ran!e. Mine was $r#m 100)* t# 10+)*,and the eact metin! "#int is 102)*. I "r#ceeded with the s#uiit% test. hecr%stas were s#ue with water ut n#t with ether s# I c#ncuded that it was an / 2

c#m"#und. his made m% s#uiit% test much easier, and narr#wed m% ch#ices t#c#m"#unds with 'e #r ess car#ns. As#, m% instruct#r said that $#r the eementatest, m% c#m"#und c#ntains #n% #%!en. I had n# idea at 'rst h#w t# "r#ceed, asthat was m% #n% ead, s# I tried rand#m "reiminar% tests $#r ac#h#s,car#h%drates, adeh%des, &et#nes and car#%ic acid. (hen I added a*3   t#m% c#m"#und, it "r#duced e5erescence, which $urther narr#wed m% ch#ice t#acidic c#m"#unds. his test is desi!ned $#r car#%ic acids, ut w#ud as# w#r& $#r"hen#s as it is acidic as we. /ince m% c#m"#und is cassi'ed as / 2, "hen#s w#ud

e #ut #$ the #"ti#n.

I tried the test $#r acetic acid, thin&in! it mi!ht e m% un&n#wn. I addeda3 and e*  which resuted t# reddish r#wn "reci"itate. I &new that this"reci"itate came $r#m the "r#ducti#n #$ e738, which meant that the ase I "utwas in ecess. # e sure, I "er$#rmed a c#ntr# test, which as# resuted t# areddish r#wn "reci"itate. his ed me t# thin& that m% c#m"#und mi!ht e aceticacid. M% instruct#r su!!ested that I "ut ecess e* t# rem#e the "reci"itate that$#rmed9 the c#ntr# turned int# a red s#uti#n whereas the reddish r#wn "reci"itate$r#m m% c#m"#und diss#ed, eain! a %e#wish s#uti#n. As#, I $#und #ut a$terc#m"etin! m% tests that the metin! "#int #$ acetic acid was $ar $r#m 102)*.

In the Merc& Inde, I searched $#r car#%ic acids that c#ntain 'e #r esscar#ns with a metin! "#int #$ 102)*. M#st #$ the c#m"#unds I $#und d# n#t haethat metin! "#int, ut their deriaties hae9 sti, I "ut them #n m% ist #$ sus"ectc#m"#unds. I had di:cut% "in"#intin! the c#m"#und ecause m#st #$ the #nesthat I enc#untered #n the inde did n#t hae eact descri"ti#n. M#st #$ them are incr%sta $#rm s# I c#ud n#t rea% eiminate them. M% c#m"#und, I $#und #ut, was#aic acid. I incuded it #n m% ist, ut I did n#t "a% much attenti#n t# it at 'rstecause I #n% !#t a !im"se #$ it #n the c#m"#und ist #n #ne #$ the a"t#"s used.#r m#st #$ m% sus"ect c#m"#unds, I used the #ther a"t#", which, stran!e%, didn#t dis"a% #aic acid #n its ist, s# I did n#t !et t# read its descri"ti#n. (e, itturned #ut that #ne #$ m% !uesses was c#rrect, ut it was a waste that I had t#sacri'ce "#ints $#r the wr#n! #nes.