investigatory Project on Preparation of Potash Alum From Scrap Aluminium

7/23/2019 investigatory Project on Preparation of Potash Alum From Scrap Aluminium

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Name of Institute: Sindhi High School, Hebbal

This is to certify that Mr.

of class twelve, Sindhi High School, Hebbal has

satisfactorily completed the proect in !hemistry for the"ISS!# as prescribed by !$S# in the year %&&'(%&&).

*ate :

+egistration No. :

Signature of Internal Signature of #ternal#aminer #aminer

------------------ ------------------


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Acknowledgement

I than my chemistry teacher Mrs. +uminiand Mrs. *eepa for their guidance and support. I alsothan my /rincipal Mrs. Mahalashmi 0iaychand. Iwould also lie to than my parents and my sister forencouraging me during this course of this proect. 1inallyI would lie to than !$S# for giving me this opportunityto undertae this proect.


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Introduction

"luminium because of its low density, high

tensile strength and resistance and resistance to corrosionis widely used for the manufacture of aeroplanes,automobiles lawn furniture as well as for aluminium cans.$eing good conductor of electricity it is used fortransmission of electricity. "luminium is also used formaing utensils. The recycling of aluminium cans andother aluminium products is a very positive contribution

to saving our natural resources. Most of the recycledaluminium is melted and recast into other aluminiummetal products or used in the production of variousaluminium compounds, the most common of which arethe alums. "lums are double sulphates having generalformula

X2SO4.M2(SO4)3.24H2O


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Some important alums and their names are given below:

K2SO4.Al2(SO4)3.24H2O ( /otash "lum

Na2SO4.Al2(SO4)3.24H2O ( Soda "lum

K2SO4.r2(SO4)3.24H2O ( !hrome "lum

(NH)2SO4.!e2(SO4)3.24H2O ( 1erric "lum

/otash alum is used in papermaing, in fireetinguishers in food stuffs and in purification of water

soda alum used in baing powders and chrome alum isused in tanning leather and water proofing fabrics.


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AIM

TO PREPAREPOTASH ALUM

FROMALUMINIUM


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P


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"e#uirement$

%2& ml flas

1unnel

$eaer

Scrap aluminium or cola can

/otassium hydroide solution 345H6

7 M Sulphuric "cid 3H%S586

9ater $ath

#thanol


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%&eor'

"luminum metal is treated with hot aueous 45Hsolution. "luminium dissolves as potassium aluminate,

4"l35H68, salt.

2Al($) 2KOH(a#) H2O(l) * 2KAl(OH)4 (a#) 3H2

/otassium aluminate solution on treatment with dil.Sulphuric acid first gives precipitate "l35H6;, whichdissolves on addition of small ecess of H%S58and

heating.

2KOH(a#) H2SO4(a#)*2Al(OH)3 ($) K2SO4(a#) 2H2O(l)

2Al(OH)3 ($)< ;H2SO4(a#) * Al2(SO4)3(a#)H2O(l)

The resulting solution is concentrated to near saturation

and cooled. 5n cooling crystals of potash alumcrystalli=e out.

K2SO4(a#) Al2(SO4)3(a#) 24H2O(l) * K2SO4.Al2(SO4)3.24H2O($)


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"eaction$

2Al($) 2KOH(a#) H2O(l) * 2KAl(OH)4 (a#) 3H2

K2SO4(a#) Al2(SO4)3(a#) 24H2O(l)*K2SO4.Al2(SO4)3. 24H2O($)

2Al(OH)3 ($) 3 H2SO4(a#) *Al2(SO4)3(a#)H2O(l)

2KOH(a#) H2SO4(a#)*2Al(OH)3 ($) K2SO4(a#) 2H2O(l)

K2SO4(a#) Al2(SO4)3(a#) 24H2O(l)*K2SO4.Al2(SO4)3. 24H2O($)


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+rocedure

!lean a small piece of scrap aluminium with steel

wool and cut it into very small pieces. "luminiumfoil may be taen instead of scrap aluminium.

/ut the small pieces of scrap aluminium oraluminium foil3about >.&&g6 into a conical flas andadd about 2& ml of 8 M 45H solution to dissolve

the aluminium.

The flas may be heated gently in order to facilitatedissolution. Since during this step hydrogen gas isevolved this step must be done in a well ventilatedarea.

!ontinue heating until all of the aluminium reacts.

1ilter the solution to remove any insolubleimpurities and reduce the volume to about %2 ml byheating.


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"llow the filtrate to cool. Now add slowly 7 M

H%S58until insoluble "l35H6;ust forms in the

solution.

?ently heat the miture until the "l35H6;precipitate dissolves.

!ool the resulting solution in an ice(bath for about;& minutes whereby alum crystals should separateout. 1or better results the solution may be leftovernight for crystalli=ation to continue.

In case crystals do not form the solution may be

further concentrated and cooled again.

1ilter the crystals from the solution using vacuumpump, wash the crystals with 2&@2& ethanol(watermiture.


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!ontinue applying the vacuum until thecrystals appear dry.

*etermine the mass of alum crystals.


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O,$er-ation$

Mass of aluminium metal ABBBBB.g

Mass of potash alum ABBBBB.g

Theoretical yield of potash alum ABBBBBg

/ercent yield ABBBBBC


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"e$ult

/otash alum was prepared fromaluminium scrap.


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i,liogra/&'

http:@@www.cbseportal.com

9iipedia

!hemicalland.com

boos.google.co.in


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CERTIFICATE

This is to certify that theinvestigatory ro!ect"CHEMISTR#$ recor%e% in this&'e is the

(ona&%e )or* of RA+I+ERMA"C'ass,-II A/$of 0.+.NO 1 2an%hinagarCantt %3ring theaca%e4ic year 5678,79.

S.0.SONI0.R.TOPPO

"P2T CHEM$ E-TERNAL"PRINCIPAL$TEACHER INCHAR2E

E-AMINER


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:ATE;SEAL


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!H#MIST+D

IN+ESTI2ATOR#

/+5E#!T

investigatory Project on Preparation of Potash Alum From Scrap Aluminium

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