Expt 12- 19

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LECTURE NOTES:

Reduction- Oxidation Titration

(Expt. 12- 19)

1. 1. Ne

Neutr

utrali

aliza

zati

tion-

on- ac

acid

id and

and ba

base

se

2. 2. Re

Redo

dox- r

x- red

educ

ucin

ing age

g agent, o

nt, oxi

xidi

dizi

zing ag

ng agent

ent

Oxidizin aent!

Oxidizin aent!: KMnO

: KMnO

44

; ceric sulfate; odine ; bro!ine;

"otassiu! iodate

Reducin aent!:

Reducin aent!: Oxalic acid; ferrous sulfate; sodiu!

Oxalic acid; ferrous sulfate; sodiu!

t#iosulfate

Note: Note:

#$ no. of electrons gained or lost de"ending on its role in redox

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E"#ER$%ENT 12:

#reparation and Standardization o&

#ota!!iu' #er'ananate Soution

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E"#ER$%ENT 12:

. #reparation o& #ota!!iu' #er'ananate

Soution* Ca!!

1. 1. %eig#

%eig# roug#l&

roug#l& 'g

'g of

of KMnO

KMnO

4

4 2. (issol)e it in 1'** !+ distilled ater in a big beaer.

2. (issol)e it in 1'** !+ distilled ater in a big beaer.

. /o)er it# a atc# glass and boil t

. /o)er it# a atc# glass and boil t#e solution for 1'

#e solution for 1'

!ins

0"re)ent e)a"oration and accelerate destruction of organic

!atters or

deco!"osition

4. llo to stand for at least 2 da&s

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E"#ER$%ENT 12:

LECTURE NOTES:

sbestos- carcinogenic



for filtration of inorganic !atter



s#ould be lined it# a glass ool as su""ort

0funnel #en used as a filter.



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E"#ER$%ENT 12:

+. Standardization o& #ota!!iu' #er'ananate

Soution

1. 1. %

%e

eig

ig# *

# *.1

.1--*.

*.2g

2g o

of N

f Na

a

22

/

22

O

440eig#ing bottle0eig#ing bottle

2. (issol)e it in 2'* !+ distilled ater in a big

beaer.

. dd 5!+ of conc. sulfuric acid

4. 6

4. 6ea

eat t#

t t#e so

e solu

lutio

tion to

n to 5*

5* /

⁰⁰

/

0!aintain ---reaction beteen0!aintain ---reaction beteen sodiu! oxalate and KMnO

sodiu! oxalate and KMnO44 occurs stoic#io!etricall& in a #ot acidicoccurs stoic#io!etricall& in a #ot acidic

!ediu! !ediu!

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E"#ER$%ENT 12:

LECTURE NOTES

tandardization: "ri!ar& standardization

7&"e of 7itration: Redox

Met#od of

Met#od of 7itration

7itration: (irect

: (irect er!anganate !et#od

er!anganate !et#od

1.

1. Na

Na

22

/

22

O

44

- "ri!ar& standard, reducing agent

2. KMnO

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E"#ER$%ENT 12:

Lecture Note!

. 6

22

O

44

-to ee" t#e acid conc. constant

"re)enting t#e for!ation of MnO

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E"#ER$%ENT 12:

LECTURE NOTES

'. <uation:

%oecuar %oecuar

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E"#ER$%ENT 12:

LECTURE NOTES

9. /o!"utation: Nor!alit&

!e< KMnO

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E"#ER$%ENT 12:

LECTURE NOTES

9. /o!"utation: Molarit&

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E"#ER$%ENT 13:

#reparation and Standardization o&

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E"#ER$%ENT 13:

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E"#ER$%ENT 13:

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E"#ER$%ENT 13:

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E"#ER$%ENT 13:

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E"#ER$%ENT 13:

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E"#ER$%ENT 14:

+. #reparation o& Sodiu' T5io!u&ate Soution*

Ca!!

1. %eig# roug#l& 29 g of sodiu! t#iosulfate and *.4 g

of sodiu! carbonate

0"reser)ati)e to "re)ent acid catal&zed

#&drol&sis

2. (issol)e t#is in

2. (issol)e t#is in 1*** !+ of recentl& boiled and

1*** !+ of recentl& boiled and

cooled distilled ater

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E"#ER$%ENT 14:

C. C. Standardization

Standardization o&

o& Sodiu'

Sodiu' T5io!u&ate

T5io!u&ate Soution

Soution

1. 1. %e

%eig#

ig#t a

t accu

ccurat

ratel&

el& 1.1

1.1g of

g of "ri

"ri!ar&

!ar& sta

standa

ndard K

rd KO

O



into a '**-!+ )olu!etric flas;

2. (issol)e in about 2** !+ of distilled ater. (ilute

to t#e !ar and !ix

t#oroug#l&.-to t#e !ar and !ix t#oroug#l&.-

0one "er class

.

. i"et '

i"et '. !+

. !+ ali<uot

ali<uot of sta

of standard

ndard KO

KO



solution

into a 2'* !

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E"#ER$%ENT 14:

C. C. Standardization

Standardization o&

o& Sodiu'

Sodiu' T5io!u&ate

T5io!u&ate Soution

Soution

'. dd 2 !+ of 9M 6/l

0do not add if not Na

22



22

O



is not &et read&-

is not &et

read&-catal&ze t#e liberation of 

catal&ze t#e liberation of 

22

9. !!ediatel& titrate it# sodiu! t#iosulfate until

solution is "ale &ello

0reduction of t#e a!ount of odine

5. ntroduce ' !

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E"#ER$%ENT 14:

C. C. Standardization

Standardization o&

o& Sodiu'

Sodiu' T5io!u&ate

T5io!u&ate Soution

Soution

?. /ontinue t#e titration it# standard sodiu!

t#iosulf

t#iosulfate

ate to

to t#e

t#e disa""ear

disa""earance

ance of

of t#e

t#e blue

blue color.

color.

B. One deter!ination "er "air

1*. /o!"ute t#e Mean N and M of

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