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2 Preparation of Alum (Recycling Process)

2 Preparation of Alum (Recycling Process) - 4‘ A Namem...

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Unformatted text preview: 4‘ / A /\ Namem 991de Section 032‘ EXPERIMENT 2 : 9,3 PREPARATION OF ALUM (Recycling Process) PRE-LABORATORY QUESTIONS The following preparatory questions should be answered before coming to lab. They are intended to introduce you to several ideas that are important to aspects of the experiment. You must turn in your work to your instructor before you will be allowed to begin the experiment. 00000000000000 0000000000000 000000000000000000000000000000000000000000000000000000000000000000000000 1. What do you understand by the following terms? Explain a. Alumina Hum nom Oxide mp3 b. Alum Fo’roieam—n Alum‘fim'fl 30% c. Amphoteric magma 09: Snowman as om acid or as a base. Cheml4 l4-Academic Year 20 10/ 201 1 2—1 2. What is the difference between a dye and mordant? We; was“ bx; hgamw bonding to éefifioese momeme‘b. Some, <3qu comm? oixaeh dime-Hy :30 m imgfmedim makicuifi Qflhecl CA movdcm’r 1% used 30 Ame, awe, (11cm amefi 31:3 ii: 3. What is the molar mass (formula weight) of potassium alum? K+(aq) + A13+(aq) + 2504” (ag) + 12H20 (1) —> KA1(SO4)2.12H20(S) (alum) K \‘L 3&3.qu3 £3in 7:. 3%.083Wmo! m \ 1x 2629181538 @5me : zcgfigj‘igsg 9‘5ng 5 Z “A 31‘ 6% (35%! 64.132 Wm: C) m \sf’ma ”affixes“; : \‘Zlaagzij a! H 24* 166.1% film! - 1'11ng {him C) \Z“~ \Sfifififi' Ems 474.31 almol / What is ammonium alum and What is it used for? / Ammonium Slum £3 Qamwnd Qflaifié Pei-owium olvm'mUm Sol-11m. 1+ 1°.» wired +0 {1“ ergonét dyes in ma‘V‘eV‘iOs‘t‘E. Chem1414-Academic Year 2010/2011 2—2 /\ Namem Hougxd Section 00\ RESULTS Attach the pieces of cloth to your report here. 1» HM Madam.- A without- movckm‘i' SIGN-OUT: All equipment is put away, and the student bench is clean and dry. TA 22 3 Date (3/43 / ' /‘\ Cheml414-Academic Year 2010/201 1 2—7 f I POST LABORATORY QUESTIONS 1. How is alum used in water treatment plants? Use any text, an encyclopedia or the web f hl . . , _ or 6p Alum es team we <1 moguiam, mm bondé eome \{EX‘ 5am aospefidfiif mfi‘mm ‘m‘ro \Qflasf 95.11““ dies 39mm? Com We“ we WWW “$25 seam and enmiofl 2. What is the purpose of a mordant in dyeing? . thimw‘rs have dale/s d‘r‘me‘n +0 mgeevicx‘xfi were em, ner’mg‘e’fi ledfi‘i ‘ . Give a reasoréias to Why the yield may be greater than 100 %. / 6 An we: in, meae Wewe er gaiggégfims 4. What gas is produced when KOH solution was added to the aluminum? Hg (M00560 . A Chem. 1414 student named J .A. Archer started the alum preparation With 0.48 g of aluminum arzd ended with 7.6 g of alum. What is her percent yield? /\ _ - M L560: . :2 e2 Qqu, x ”‘1‘” : 1.37.194 melPrE 14:351‘10Q" zcms 3 Qt ='Z.G>H§% \ S541 :O4r‘48 .f’ , ‘ . we"! ‘ zap “gem % 7.09% a {Hzazyq-‘om‘fi 474.465 HXZ‘l: Zqflals / : 0.432233gdl 4,74%; filmed 5‘5 l V a Geé’igz‘éfi‘ X 43:3...» -: “me HQ imam hacleo’z 255mg * __,....—————- xiGO : new? ‘ . , 30. ‘70 Yield Cheml414—Academic Year 2010/2011 2‘8 ' 3' /j ...
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