Investigatory Project Chemistry class 12

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INVESTIGATORY PROJECT ON

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“Metal coupling on rusting of iron

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Su!"itte# !$

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A%a$ Pan&ar

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Roll no '(

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t+

St# )*II ,

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CERTIFICATE

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T+is is to certif$ t+at A%a$ pan&ar +as 17successfull$ co"plete# t+e in/estigator$ 18pro%ect title# “ Metal coupling on rusting of 19iron an# su!"itte# to t+e 0ept1 of P+$sics 202Montfort secon#ar$ sc+ool2 Nagpur an# carrie# 21out !$ +i" un#er t+e gui#ance an# super/ision 22of Ms1 Sa/ita A%a$ #uring t+e aca#e"ic session 2334-5(34-61 T+e sai# &or7 +as !een assesse# 24an# foun# to !e up to t+e stan#ar# en/isage# 25for t+e le/el of course1 16

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0ATE'(

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Re/18ro1Jagan Mo+an

Re##$ 32)P+$sics teac+er, 31

)Principal,

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INDEX

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Sr.no

-1 31  

91 51 61 :1 ;1 <1 =1 -41

 

CONTENTS

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AC>NO?@E0GEMENT INTRO0CTION Rusting on electroc+e"ical "ec+anis" Met+o#s to pre/ent corrosion O8JECTIVE MATERIA@ REBIRE0 0IAGRAM PROCE0RE O8SERVATION RES@T PRECATION

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8I8@IOGRAPY

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AC>NO?@E0GEMENT

Pri"aril$ I &oul# t+an7 Go# for !eing a!le to 41co"plete t+is pro%ect &it+ success1 T+en I 40

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&oul# li7e to eDpress "$ sincere gratitu#e to 43"$ p+$sics teac+er Mr. for +er 44/ital support 2gui#ance an# encourage"ent 45&it+out &+ic+ t+is pro%ect &oul# not +a/e co"e 46fort+2 an# la! assistance an# support 47t+roug+out t+e pro%ect1 I &oul# li7e to t+an7 "$ 48frien#s &+o +a/e +elpe# "e &it+ t+eir /alua!le 49suggestions an# gui#ance +as !een +elpful in 50/arious p+ases of t+e co"pletion of t+e pro%ect1 51@ast !ut not t+e least I &oul# li7e to t+an7 "$ 52class"ates &+o +a/e +elpe# "e a lot11 42

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(AJAY PAN?AR

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Roll No'( ST0 -3t+

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INTR!D"CTI!N

Metals an# Allo$s un#ergo rusting an# 62corrosion1 T+e process !$ &+ic+ so"e "etals 63&+en eDpose# to at"osp+eric con#ition i1e12 64"oist air2 car!on #ioDi#e fro" un#esira!le 65co"poun#s on t+e surface is 7no&n as 66corrosion1 T+e co"poun#s for"e# are usuall$ 67oDi#es1 Rusting is also a t$pe of corrosion !ut 61

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t+e ter" is restricte# to iron or pro#ucts "a#e 69fro" it1 Iron is easil$ prone to rusting "a7ing 70its surface roug+1 C+e"icall$2 rust is a +$#rate# 71ferric oDi#e e3O91n3O 1 68

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Rusting an Electroc+e"ical Mec+anis"(

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Rusting "a$ !e eDplaine# !$ an electroc+e"ical 79"ec+anis"1 In t+e presence of "oist air 80containing #issol/e# oD$gen or car!on #ioDi#e2 81t+e co""ercial iron !e+a/e as if co"pose# of 82s"all electric cells1 At ano#e of cell2 iron passes 83into solution as ferrous ions1 84 e e 3F F 3e( 85T+e electron "o/es to&ar#s t+e cat+o#e an# 86for" +$#roD$l ions1 87 3O F )O, F 3e( 3O( 88n#er t+e inuence of #issol/e# oD$gen t+e 89ferrous ions an# +$#roD$l ions interact to for" 90rust i1e1 +$#rate# ferric oDi#e1 78

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3e3F F 3O F )O, 3e9F F:O (

3e9F F 3O( e3O9193O )Rust,

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Met+o#s of pre/ention of corrosion an# rusting

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So"e of t+e "et+o#s use# to pre/ent corrosion 103an# rusting are #iscusse# !elo&'( 102

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8arrier protection' ( In t+is "et+o#2 a !arrier Hl" is intro#uce# !et&een iron surface an# at"osp+eric air1 T+e Hl" is o!taine# !$ painting /arnis+ing etc1

Gal/aniation' ( t+e "etallic iron is co/ere# !$ a la$er of "ore reacti/e "etal suc+ as inc1 T+e acti/e "etal losses electrons in preference of iron1 T+us2 protecting fro" rusting an# corrosion1 n n3F F 3e(

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O!%ecti/e '

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Materials reKuire#' (

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T&o petri#is+es2 four iron nails2 !ea7er2 san# 134paper2 &ire gauge1 Gelatin2 copper2 inc an# 135"agnesiu" strips2 potassiu" ferric$ani#e 136solution2 p+enolp+t+alein1 133

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D#agra$%&

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Proce#ure'(

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-1 Clean t+e surface of iron nails &it+ t+e +elp of 153 san# paper1 ?as+ t+e" &it+ car!on tetrac+lori#e 154 an# #r$ on Hlter paper1 15531 ?in# a clean strip aroun# one nail2 a clean copper 156 &ire aroun# t+e secon# an# clean "agnesiu" strip 152

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aroun# t+e t+ir# nail1 Put all t+ese t+ree an# a 158 fourt+ nail in petri#is+ so t+at t+e$ are not in 159 contact &it+ eac+ ot+er1 16091 Preparation of agar agar solution1 eat a!out 9g 161 of agar agar in -44"l of &ater ta7en in a !ea7er 162 until solution !eco"es clear1 A## a!out -"l of 41-M 163 potassiu" ferri(c$ani#e solution2 -"l of p+enol( 164 p+t+alein solution an# stir &ell t+e contents1 16551 ill petri#is+es &it+ +ot agar agar solution in 166 suc+ a &a$ t+at onl$ lo&er +alf of nails are co/ere# 167 &it+ liKui#1 16861 >eep t+e co/ere# petri#is+es un#istur!e# for one 169 #a$ or so1 170:1 T+e liKui# sets to gel on cooling1 T&o t$pes of 171 patc+es are o!ser/e# aroun# t+e ruste# nail2 one is 172 !lue an# t+e ot+er pin71 8lue patc+ is #ue to t+e 173 reaction !et&een errous ions an# potassiu" 174 ferric$ani#e to for" potassiu" erro( ferric$ani#e2 175 >eLe)CN, : &+ereas pin7 patc+ is #ue to t+e 176 for"ation of +$#roD$l ions &+ic+ turns colorless 177 p+enolp+t+alein to pin71 157

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O!ser/ation'(

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S1No

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Metal pair

Colour of patc+

Nail rusts or not

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-1 Iron(inc

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Iron( "agnesiu" Iron(copper

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Iron(nail

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Conclusion' (

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It is clear fro" t+e o!ser/ations t+at coupling 183of iron &it+ "ore electropositi/e "etal suc+ as 184inc an# "agnesiu" resists corrosion an# 185rusting of iron1 Coupling of iron &it+ less 186electropositi/e "etal suc+ as copper increases 187rusting1 182

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'I'(I!)RAP*+

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TE GIVEN SORCE O INORMATION IS TA>EN 198ROM 197

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Co"pre+ensi/e )Practical C+e"istr$ *II t+, Internet 2&&&1google1co" NCERT C+e"istr$ teDt!oo7 )*IIt+,

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