RECRYSTALLIZATION
AND DETERMINATION OF BENZOIC ACID
MELTING
POINT
J.V. J.V. DE GUZMAN DEPARTMENT OF CHEMICAL OF CHEMICAL ENGINEERING, COLLEGE OF ENGINEERING OF ENGINEERING UNIVERSITY OF UNIVERSITY OF THE THE PHILIPPINES, DILIMAN QUEZON CITY , PHILIPPINES DATE PERFORMED : JANUARY 30, 2015 INSTRUCTOR ’S NAME: ALLAN KENNETH REGUNTON
ANSWERS TO QUESTIONS 1. How doe ! "#$ed %&$e' (!(e' )!$e* %&$'!$+o*, W)- + +$ !d+!/&e $o (&!0e ! !&& (+e0e o2 w+'e /e$wee* $)e 2#**e& !*d $)e o#$) o2 $)e "!3 d#'+*4 )o$ %&$'!$+o*, Co!"#$% &o " 'o()$(&*o("+ +&$# !"!$#, -&$% +&$# !"!$# /"&$( &/$ +&#"&*o( "**4*( &/$ 'o(&"'& "#$" $&6$$( &/$ +&$# !"!$# "(% &/$ o+&*o( "(% *(**4*( &/$ 'o(&"'& "#$" $&6$$( &/$ 7(($+ "(% &/$ +&$# !"!$#. T/$ #"&$ o7 +*8*% -o6 &/#o/ &/$ +&$# !"!$# *('#$"$ $'"$ &/$ -&* -&*( ( o7 &/$ &/$ +&$ +&$## !"!$ !"!$## !$# !$#*& *& "*# "*# &o $(&$ $(&$## &/$ &/$ -"9 -"9 "+o( "+o( *& *& *%$ *%$ "++o "++o6* 6*( ( 7o# 7o# !#$ !#$ ##$ &o #"!* #"!*%+ %+ $8" $8"+* +*4$ 4$.. P+"' P+"'*( *( " "+ "+++ !*$' !*$'$ $ o7 6*# 6*#$ $&6$$( &/$ 7(($+ "(% &/$ o&/ o7 -"9, o( &/$ o&/$# /"(%, #$+*$)$ "( !#$#$ *('#$"$ #o/& &/$ /o& +&#"&$. T/$ 6*#$ !#$)$(& 7o#"&*o( o7 " o+)$(& $"+ $&6$$( &/$ -"9 "(% &/$ 7(($+ *('$ '/ $"+ 6*++ +o'9 &/$ )$(& o7 "*# %*!+"'$% &/$ +&#"&$ &/ #$+*$)*( &/$ !#$#$. !#$#$. 5. E*#e'!$e 5 $e0)*+6#e $)!$ 0!* )e&( ('ee*$ ('e!$#'e 'e0'-$!&&+7!$+o*. 'e0'-$!&&+7!$+o*. E8(&!+* e!0) +$e. W)!$ 0!* /e $)e 0o*e6#e*0e +2 ('e!$#'e 'e0'-$!&&+7!$+o* 'e0'-$!&&+7!$+o* w! *o$ !o+ded $o o00#', ". Keeping the !t"#ti$n %et&'p (#"); (#") ; &/$ /o& o+&*o( 'oo+ " *& #( &/#o/ &/$ +&$# "++o6*( '#&"++*4"&*o( &o o''#. <"#*( &/$ 7(($+ "(% &/$ +&$# +&$# !"!$# !"!$# &/ &/ !#$)$ !#$)$(& (& &/$ /o& o+&* o+&*o( o( 7#o 7#o '#&" '#&"++* ++*4* 4*( ( %#*( %#*( +&#"&*o(. o(. H$"&*( &/$ #$'$*)*( -"9 /$+! !#$)$(& !#$"&#$ #$'#&"++*4"&*o( " &/$ +&#"&$ "''+"&$ *('$ &/* !#o%'$ )"!o# &/"& 9$$! &/$ 7(($+ "(% +&$# !"!$# 6"# &/ !#$)$(& ! #$)$(&*( *( '#&"++*4"&*o(. . P$'"ing the h$t %$!'ti$n in %)#!! #)$'nt%; I& !#$)$(& #$'#&"++*4"&*o( *('$ *& +$$( &/$ o+&*o(= &*$ *( &/$ +&$# !#$)$(&*( *& &o 'oo+ "(% '#&"++*4$. I7 '#&"++*4"&*o( "+#$"% o''#, !o#*( "++ "o(& o7 &/$ /o& o+)$(& %*o+)$ &/$ o+*%. I7 !#$"&#$ #$'#&"++*4"&*o( 6" (o& ")o*%$%, *& *)$ " +o6$# !$#'$(& *$+% "(% "(% " ($"&*)$ $##o# $##o# *('$ &/$ "!+$ &/"& &/"& !#$"&#$+ !#$"&#$+ #$'#&"++*4$% #$'#&"++*4$% '"((o& $ "''o(&$% *( &/$ &o&"+ *$+% >(9(o6( " "(% &/ 'o(*%$#$% &o $ +o& "!+$.
9. A +8$#'e 0o*$!+*+*4 5.: 4 o2 A !*d ;.: 4 o2 B + $o /e e(!'!$ed !*d $)e 0o(o*e*$ (#'+%ed /- o*e 0'-$!&&+7!$+o* 2'o 1:: L o2 o&e*$. T)e+' o&#/+&+$+e o&#/+&+$+e !'e 4+e* +* $)e $!/&e /e&ow<
So&e*$
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B
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10.0
5.0
20.0
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20.0
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15.0
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10.0
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1:: & o2 )o$ !0e$o*e o&#$+o* 0!* d+o&e 5: 4 A !*d ; 4 B acetone x 100 ml acetone
acetone x 100 ml acetone
20 g A 100 ml acetone acetone
8.0 g B 100 mlacetone
20 g A
=
8.0 g B
=
1:: & o2 0o&d !0e$o*e o&#$+o* 0!* d+o&e = 4 A !*d :.14 o2 B 100 ml acetone acetone x
5g
A 100 ml acetone acetone
5gA
=
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. o7 B '#&"++*4$
7.9 g B recover recovered ed
present initially 8.0 g B present 2.0 g
A x 100 crystals 2.1 g of crystals
x 100
=
=
98.75 yield
95.24 purity
of A
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1.05
5.@
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20.5
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3.5
MITURE: .0 A .0 B .0
H$"& o+&*o ( MOTHER LIUOR: .0 A 2.3 B 3.5 C
UNDISSOLED CRYSTALS: CRYSTALS: 1. B "(% 0.5
Coo+ o+&*o (
MOTHER LIUOR: 1.05 A 2.3 B 3.5 C RECRYSTALLIED: 2.5 A
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EAPORA; TOR
MOTHER LIUOR .0 A 1.15 B 1.5 C
Coo+
MOTHER LIUOR 0.525 A 1.15 B 1.5 C
50 L $&/"(o+
UNDISSOLED SOLIDS: 1.15 B 1.5
RECRYSTALLIED: 3.5 A
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