EVALUATION OF REDOX SYSTEMS AND
INDICATORS IN ACETIC ACID

The”: Ior I‘IIe Degree of M. S.
MICHIGAN STATE UNIVERSITY

Nahida AI-Qaraghuli
1958

all” 27)

 

 

EVALUATION 0? RED! mm ”ID NDICATORS
m LCETIG ACID

ATEBSIS

mum: to the School of Gum-to Studies of
Human auto College of Agriculture end Applied Sci-mo
in W (11111111116316 of the remix-wt.
for the degree a:

MSTER OF SCIENCE

Wtdmm

1958

ACWWT

memflm-Mutowhcnncm
momma-Mum:
WM.

VITA

nun MAL-«um

I“! ”N’DWUW911‘Q

w W m 31¢ School
BM, Iraq (19104-1916)

Eon). College of Ola-1m and PM
Baghdad. Iraq (ISM-1952)

up... mandala.
Bold! mmuwwm
(195!)

TABLE. OF COHTEET‘I‘S

nIlim‘mcmneeeeoooeoeeeeeocoooeooeaeeoeoooeeeeoeeeeeeeeeoeoeeoeoo

":3 EH.
mmhImLI¢OOOOOOOCOCOOCQCO...00.0.6000...GOOOOOGOCO'OOO0.0.0it

mmueuoeoeeeeoeeoeeecuoee0.000.000.0000oooeooeeooeeoecee-
PPBMtim O: Solutimauuuuuunu.u.............u...
1. SW mu.cove-cocoeoeeeeeueeeooeeoeoeeeeooeooeo
20 W hmmtocmu meeeooeooeniece-00.0.0000
30 Tim! ”mum...eeeooeooeeoeeeeoeeeeoeoeoeeeoocan
he Ferrous o-fiaenmthrolim mueeeoooooooooeooeeeeoe
AWWooooooeoococo-cease..-coco-eeeooeeeeeeoooooeeeeeeoee
mm. LCM“ mam MMcvoeeooeooo-uodeooeeeoone
WW SM”...ooooooeeoceooeeeeeocoo-eeeeee-eoeeoooooee
10 o-thanthrolan-fml Weeeeeeooeeeooeeooeeee
20 DimWWOOOOICOOOOO00.0.0.0IIOOOOOIOOOOOOIDOCOOO
30 HWIQ‘C blue.one-cocoo-eeoeooeoeoueeeeeeeeooecaeeeo
he Ritm-o-mmthrolmo-tmmi complex...uuu.u.u
Se 1'11ch mw.ooeeeoeeeoeocoeoeeeoeeoeoooeo

SLQ£.&mCOIOOCOQCOOOOOOCOOOOOOOUOOOIOC’IOOQOOCOOOCI‘OUUOOOIOOUOO0..

15mm cmDOOIOOCUOOOOC.DOUGOIOOUO'IOCI.OCIOIGOOOOIIOOOOGOOO.

AIII-EmmtOOOIOOIO‘OO.OQ0......i0‘000O.CCOOOOOOOOOOOUOOOOOOOII.O.

iv

3
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£35

mm:

mrmwcnou

Mia-Mmmummuflhwmmbmdmumu
Mon-Worm. Hemmboennporheden
themetmdiutouufi). WWMmmxmamwm
mmmwmmmrormmmm. It
ammememmmummmommmmmw
mmcmpummmmmmmmawu
Wmmtmmwmnuobmdmmm,mn~
mm.mmmm.

mthenmhnmthmamtmmmmmgtmmo:
mmmnmmmmmmwmdwum
Whmudhufi). mmumdumum)
munmmummmttmmnmm.

mmmmte(fl)hubeanmummmg
wmutummtymwmum.mmvwmmnm
wow-mama. '

mobJMdthumx-kmtodmlopemmeumu
mumtwmmormmwmm. Applies“.
of Whammutnfimmumdiod.

mm
1' we. maummam 'm' "°"‘ "'"
3. mm acid - Depent man.
3. Pueblos-13 mid . W 'AR' nude. Can. 701, up. u. 1.6.
h. adamant-annex 'mgnt- mmmw.
S. rmmmu-Wo Manned".
64mm mmmuua.mmsnmmco. mi.
7. ferric chloride a Purified ”PL-her Mental-:3
B. W Hmnitnteomte IV 0 G. W 381th W Go.
9. lea-run mfiu.a. Wannabe-4mm.
10. mm-mw-Wco.
11. M mum-no - leak “ream.
12. o-W-G. munch-mace.
n.3nmx-udowmmcuum).
WWW-thmmum. hem-awn

15.Wawxmcm(mumm.

16. nmm-mmcm.
ILMWOOM'W.
18.nm-mu-W'w m.

39. cmmmuuu. Wadfih'w Oe.
”.muma-wmmm.
naum-wmmgmmutymuma).

Preps-Mann! sebum

1.mmu.tu.c.o.

10.011um1morscammunmmmumm1lum
mammal-inns preparedbydiuelfingo.61woteod1nn
mumemdw.zon1.parchloriowmmtodtolooon.
ummmmma.

z. W 2113:3112!th), (mumdma). «a
mmmm.sm5°rormhmms.hemm
Whmnmmmumumo.o1nmm.
mmuemmuumwum1nmmun. monom-
Mummmmmuwwmwm.

Lat-mam»

gwmgumnmmmwuamumn.
mmmmson.ammmmwmmu
mammumm.mwmwmgmmfi.
mmm-mumnummmmm.
mwnmmnuummdbmummmormmm—
lug-dinning. unnummmmwnmmmmm
maniac-tam. strummmummmm
umummmummmuwmm
«them. mumunummwumpmm
wmmnmmmmmuummwum
«u. m “mm-am done mummy.

Limo-Woman»

mmuwmmmmwunmumtm
“etc-Wmmodvflhmmhoftm.

InueWi-omtmapemhlmte,eo.01lee1nuenu
me3.msmotMm.)r6a.ommn.m1-1
mmmawmummumumm
swam-mammtmummmamaw
Manama. mmmmmmummm,
htttpedpihtd.ummlntimmtflwmaheaooch
MILO. Mmhtimmewndvithmmflm
new”. muofilso‘auumdotmplmthmumul
Whnmdtmmmblflofl.do.ml
mmuufl.» mumwmmmmm
mxmmmmu,utmmmmo¢ummu
an. Mm.wm-ltumum.

huefimhmtmmmmu0J93mm
“find.“mmmmflfMByOSth
cum. mrmmmumwm
mummm,hnmmmo-pnmmmum,
wemrdmhretmmmpdm-uuthflm
«wrmemummrmmmuu
coin.

App-mm

Ammm-Wmm,mn,z,mmror
Weaken”. AWMMMWW
mummmnwmumummmmm-
format-endpoint. mumfimmmum
mm. WMNMMhWth-W
Munda- tho-mmnuummmmum
mnuam. Wmmumumwm
mummmumm.

WWWW

rwnmmmwummummhm
wwmrmmmmmmm
umwmwmummotmmm
WWatm-nmdmtmmm
mmmwmnmm. nmmmun
ummummmmmmmmmm
mmmwmmmm. Somme-elude
mmwummm.

ammummwmmmm
wwmm. mmmmmmmmmm
umgwm. mmnmmummmu
WW.

m,mryuuhmuwmmmumdu-m
mummmmumwnmu
m.(1). mmdmmhmumtunmm
eta-inmate“.

w,ummmwmwmuuu
mnem. WMm’MWd-mm
mmmmmmmuummwm
moth-W. math-mmwmmaoJxmm-a
«mmuumum. hummus-Mom
Wumdmm. mmmwmmn
ummmmemmmnmemww
hmumanmmmmmmm
mm-mmmtumuwmnnmn.

mm rummwwwmosxmmm-
enumuumhumwmwm. mum
mummtmumdnmmmunmm
Mama-Ann. mmAu-Wm‘
mumm'upmm‘u‘umu. hummu-
mcmnmtmum05nmmpmhmnmw
ummmnm.(1)wmtmnummmma
mmmmn‘ummmmmmudm
amen. mmmu'mwummmm:
mm. mmmmumemumm
mummummmmmamm.

 

 

 

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ax Hg + Hg;(0Ac)£

 

 

 

$AS BE STO 5 FIBER!

 

 

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FIGIJRE-l- MERGUROUS ACETATE ELECTRODE

Meteor 8W

Withmmmulmlmhrflmem, it”
moummmummmmmmm
unmwmquMmmdm-wm.
motmmmw.mmmnmmmtmmmum
timbmhmm. nmnmmmumuumwm
amumnmmmmmummwu
mmmmwummmmmw.

LWWoaupl-uu

mammaotmmmmmumupm
mummmpflw-thmmumwmm
Mire-mum... mwdem‘wmuw
Manna-am. mummmomlmmuu
mwmmumnmo,mmn.aomlm(n)u
mwumhutm.muummmmmm
mllufimumumewipimtmd. mum
mummmwwmmmmmamu.
«www.mmmmmwbmnmmm
magnesium» mmmrormmu
9.6mm. mmwcimmmmw.
m'WuWwammmmn-md
mm. ‘

Wmmnmmnpmmmam
e-WWWumWhufleflm—W
«mum.

mammmmummaomnoammum
mmuummumnumomxmm} mm
«ammo-thmmmmm
ummmmmm. armament»
0.9mm» mtmmmmmmumuo.w
nu. mmmmnoAfioma-«mmum
We. mmnmammmmmumw~
WMuethmwMI-m. upma-
www.mmmmmumn
m1.

m1

mm at «mm mm: hm ammulrv) ~
o-mmn'mm corms: AS mmmx

 

 

 

numumumamnwmavmm
mmummnmummaomum
mnmwnummumumuuoml.
cmwuwmwmmmmmmm
mama-1. ' '

Wuwmnmmmmumumoromn
mmummunmummw
nhmmumwonmpoxmmmur. m.-
MmMWMMemueolm-wwm
mum-nun.

homunlwoolntimofo-phmthmhno-tm emu!
WMunmethomWflmumot
mwduemfl. Edmthaindicatarmtflad,amtio-
mun-mm cloudinesMDuth camn(xv)m uda. mun-n
thmmmanmuo.éoownmmwm
Wm.to.930m1t. nmmmwtmmo:
«mmmmmuummmmummu
ummwmmaéuthm-Iv. Cmml.otlnlodinnuide
«humme50n1. wcmmetuummn'um .1. muted
MWMIMflNOfilHWMMdW
o-flxmthmlimtmeemplnmw. mmuoomum
umeMnrpI-touaxtblno. mnmumshmm
”1-11. “mumwmwmomamm
Mmuideflmhmwmdhm.

femn.e£themuidoaohtiminewpperadm
"masondcemhtmmnmmmmuuua
Walnuts. mmmm~.mumnywnw
tomxormm. 'mo.5motpahedu1edmemaddod.
umcmmmmummmmmmmho.maxmm

Wm. nwmmpointmml.o£eumhlolntiumm
«summer. max-mm mmmmngommumuumu
wmwumumotummmuumwnhcmnmm

mummuo-anmpluummm.

mm II
mrmn op Ammrmn m cm (IV)

»...A. -~——--- - “aw“..o-wm - --—.-—-_

   

“cu-Mnfinmm.~- . .fi...~.a—~ .. - .. QM..."

 

 

!

Am 301nm In. Ca xv m. 6450‘). m, seq/n1.
need

 

 

 

 

n1. 0.019? N f
e-thtau'enne Capt. n ma:
1 1.3.20 0.2600
1 13-15 0-591
1 13.10 0.2531
Harbin" Mod
3 0.7152 0.25314
3 0.7752 0.2581;
memo-mm Couple 0.- Master
1 17.2 0.3388
1 11.2 0.3388
.2. MW' at

qu-uw mama“): c.01uemm
Mthummuhmmpthebediphmw
hairline. mumMmMmew-eimuhtm
mummummmumwnmaenmm
Wanton-W. ummwuumumu

omxmmmacdimummmmgzummmwmumOMH
mmnmuarmmmtmmmmm
mmmuummmmmwmmwotu
Maddaehupmhlodnmidmmuauy. bmumthe
aha-need perchlorio wide precipitate tamed. Emir-five ll. of
omummouommmdahmwsoanhucmwm
lxummumum. Itmtomdthetthewutor
mefiWeWB-mpadmvflhdthullar
OJIpmhlefleacidlolntm.
nllmmmmmmnmmrmlmmmtum
Wmo.hoovo1tanammmmtmmmuo.mo
wit. no.5:mmmummumwotommm1mm
mwmoaéownmmbmmmmmnwéo
an. mmummmmmummmm
wmamnmrumumum. mountain-mm
MWWWMMWmmmWWWW
mum. mmwrmmwamu
mmmmnmuawmrumdmclanIpu-cm
ablation.
Anettmptmudeumgdifixwflemmummnuwhthe
”Wflmflmottmmhlmumummllh
ammummamu. mummmw
hmutbmmmWeolmemwmm
Ma.wmmmummuummwm
mmmumozrmmumummumln

ammumuthomncmm). mmmnmdtom
mummmmrmwwmmm.

AWe§Wmmmlmdummmm
nummmmmmmmumumammamu
umemllmmmumnmummnuma
Muhammdumga. omdropdtmepuvhlmteeohm
hmuumeummmor-uuummuushm
upwumpmommammw. momma-m
memuihmmmedm-mmmewm
M.

mwmwmummwaum
nmummummmmummmm
uwummmu. mommmenmmm
mamuummuumtmmummwmmwu
also.

Lama-bin...
mmmmmmmmmunyum
ummummmmuammunmom no
mfinmmmumfimflemmnwmbme
mmmummmwMammuum-ma. mum-1.
«omnmmmmumMmmwu-ston.
nummwmnmmwmu'mmmuw.
mun-mama: mm. m fmlpotmtmmo.165 van
wmmhmmeto.020volt. mznmmuum

mmotmmmmeuomsvon,mmwum
meme-sumozswn. mmmmmmmeu
mumumm. Mmmdiatmeteolarewge
wmwupomm. Mwmuuotthendeem,
num(m)ulnumoonmdpumnneleottheindmflor.

wetmpummunmmplmmamnymbmu
animator. maxetmmanmmmumumo:
mmuumumm(m). mum-mum
mmmmmmummmmnm.
Wetmmmmmummatmmmuu
umm(m)mnu.butmmpmoboam. mum-Lemma.
mWohwflhuflummdemmmh
tmmmmutmmum‘mmmmum. no
mummmummnotmumum(m)m
uhmgmmammmmuaunm.
ummmmmmmmnmmmh
mum.

ho nMWmoMMc-I
mucuwutmwmmtyornmuomn
wmuummmmunm
.wnmwumdmmuomlum
mmxunmumwvflomnmm.
umtuuummhmmmmm
mmumno.mnn. ”Whptvtantmwlt

0.950 volt.- flu tern]. potential for the malaise oxidation was 0.685
volt». The WW “trauma agreed with the Mentor titu-
tians u than 111 m1. III.

mm

mm or 301mm own m min)
nmmnnmam AS nmmma

--. - mm -'-w~--‘-.—..--o---Ah—fi—-o——.—n ‘nh“~"www—swflw--—*.OIMIM1-.§Ii-“ ”WA—Mn.

   

 

31' Mane n. Go {IVI
Indie-tor mama-1o
35 25085 ~‘
25 25.80 .......
25 25.80
25 25.85

 

 

 

mutt-Immanuel. “matted-Wm: complex
uuwnmnummwmumumm\m Itmtamd
mtmmotuquobWbywn-uwmwumm
(mn)didmtoeimideufl1themotneq./m1.obtunadby
WM moan" (Table II).

S.W1nd1eetoreon
Wmmumwmmmummgrm
chloride with um Illa". The indicatordidnotvorkbmu the
manmmmmm-mmmpomtmdnrm
mutation. mrmmmmummobm by upswing
tmmmmummmmnmpmoruummw

portion! to help dieeolve the ferric chloride which was incomplete]:
callable 1n ecetle eeid elme.
m0£llm1nt1anetneutrelred1neoetie ecumdelfimdi!!!
1n mpect to perchlorle acid was titreted with titanoua mlfate.
It we! found that in either eolntlm the break in potential we too
eerly end thet m efter the eddltienot one :1. of titanoue Innate.
Be an. 1ndieetor m neglected because we could not get are 1211'th 4
me the foul potential or the petmtlel et the break which eneblee
themdlctlmotuunsthemtnlreduenlndloetormnrlme

m.

m” 17
WWWOFMXWMDM

 

Fowl 1’0;th , Potential et

 

Syetu Iv. Cole: Cheese

affirm” 1295
iltro-o-plmnthroline tea-rem complex 965
or"-cr“ (1 n 3.30.) 930

r-"a." (1 H mm.) 690 '

6,05» 200. 620

o-Phemnthrollne tame complex 660 860
2r," ~03 I. 610

to” «- r." (1 I 3.50.) the

WW (1 l $10.) M30
WW (1 ' 3:334.) 335

new?” blue (1 I mm.) 175

21” «- 11“ 4-150

 

‘__. A“ .m— _-—_._ A A__
w m w..— _— w 1

*VI. nercuroua acetate electrode.

16

Thin work was done to study m reaction-mum eyetene,
indicate", end eppncetlone to mm studied. he: the titretim
methetoml potentmmrbothmteneendlndioetore,thepotutm
et the eminlence point, and the potentiel etvhieh the indicetor ehenaed
colorwerereed.

Lmiun hmltntomnu end pom-mu aloha-ante we need ee
mddninaegmteheeeueeottheireelnbmwmmeefl.

fitenme ulteteveeueedeeeredueinzmtendituemred
bydieeolvingtitenmneteltnemmreoteeetleeemplnenlmm
acid. Ituepouihleteobtelnenrletyotmeutntmbyvemnc
thetimotrefluinz.

Titration: were done potentimetrieelly using e epeeielly panned
mum“ retmelectrodeendepletdmneemgeleetrede.

Ineomceeeeitveedeeirebletocheoktheneultebyordmwlndmtor
titntione.
The following cheerntlnee were lease
1. Rue paedhleteeerkuthtitenme eolntianunderen
emmmotnltrogeninordertoredneethente of
mun-um o: um by the etmoepherzle mm-
2. meow-”dumpleemefleetedbythepreeenceot

etronzeeldeeucheepemhlorioecidendeulfimnoecid.
AefluemmntoteeidimreeeedthebmkinpotmtieIOI

 

(J

 

17

the eyetm increased. In case or the dichromata-cbmmic
system unmade acid had the some effect. The titanium
system as also affected by the presence of strong acid
such as mptmrie ecid.

3. um: eultate m etandardized potentiometrically with
potassium dichromte.

L. All the indicatore used were soluble in acetic acid and
the solutions were stable for a long time.

S. The iniicetore which show poeeible application ere
o-ghmnthroline I'm. complex in the titration of
eodinnmletevithoermlvinllpachloricecidmd
in the titration of eodinn aide with cue-inn IV.
Kitro-o-phmthroline-i‘ermue complex applied in titre.
timofeodmmmrithcermmfl. Bothindicatore
show a. distinct en! sharp color change at the and point.

me CITED

18

LITERAW CITED
1. Kolthoft end Monger, "Volumetric Anelyeie 1:,'I pp. lOSolhl,
Intel-science pmliehere, Inc. Belt lurk, I. 1. (19M).

2. wan/an we end Chem, .1. An. cm. 800., 5;, 3908 (1931);
55,. 265.9 (1933).

3. mm, J., J. Am. Chem. Soc... 92, 2133 (1927).
1.. mm, 0., m. n. mm, mm Stete Unirmity, (1951.).
Se Mil, We Ce. Phe De M. W 3““ Unimi'ty, (1958).

ham-imam Reculte
Arranged in the Order Hmtioned
inthe M

Titration of o-thenthmline—Fme Complex 1 R in Respect to
Perchloric Acid with Cerium IV

 

 

 

22 .8 990

o 370 20 .l 689
S 61.0 20.2 690 g 2 1,333
12 660 21 702 21.. 1.110
13 661 21.2 110 2h ! 11112
u 6& 2101. m an . w
15 661 21.6 m 25 _ 1:50
16 670 21.8 721; 26 1155
13 676 22.2 820 28 use
19 631 22 J4 390 29 1163

 

A.‘ ___._ w A __ -__.._ __.. A“
w“. a w— ___...__ m ._._. “w, w 4 __..__ i.— wet—.7 __ W

TitretionotficdinnOnhtevithCeninRee-aceot
o-ththroline-fcrrme complex en en Indicetor

 

 

 

n

 

 

ummummuhmlaeil
umumumcmn

 

m Eocene

34:6."

Jone“
nunDDDD DDDnDu

 

t.

m www.mmmmmmmm

. 4344...“... act... e
mu

n ’99,,”

nnnn

immwmmmmmmmmm

 

and» Jen
n 01235788 e.

mmcmmhamlmiewm

w

“m

wnuuummu

 

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halt

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m 55m

i3...»
inuufiflnw

 

mmmmmmw

$33,.

nuance”

Mmmmmmm

ozamnmu

TitretionotSodmnideinLcctinicidan
inPa'chloricAcidUithCec'imIV

 

K1. Wt m. Wt Hi. ”01‘
o 603 12.2 610 13.6 1150'.
2 608 12.11 620 13,3 11;; .
I; 610 12.6 630 111 1260
6 610 12.8 630 15 ~ 1275
8 61.0 13 I 635 20 ‘ 1300

10 610 1.3.2 1000 25 1310

12 610 1.3.1; 1230 \

M A...— 4 ____ .g... A“..— .k“ A..._ . _s_.~ _.

 

 

 

Titration of Dimmhxnine in Acetic Acid 1 I in I
Pcrchloric Acid with Cerium I? A

   

 

 

 

 

 

111. ms 121. Knit :1. unit
0 380 20.1 500 23 825
2 381 20.9 570 21: 81.0
S 382 , 21 63.0 25 850

10 392 21.2 705 26 855

12 too 21.1. 71.9 28 860

13 1.00 21.6 170 30 865

11. 1.02 21.8 780 32 81c

15 1.10 22 790 35 875

16 1.10 22. 805 So 890

13 1.22 22. 310

20 use 22. 812

30.2 1.60 22. 820

20.1. 1.68

 

I
I
I
I
I
{I
II
I
I
I
II
I
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Titretion of Potassium Dichromte in Acetic Acid 1 B in
Wt to Sulpmric Acid with Iitencuc Sulfate

 

 

   

O
E I

 

Kl. Wt 10.. molt X1

0 930 1.3.2 858 1.14.55 1.1.0
10 950 1.3. 860 1.1..6 3-20
20 939 1.3.8 8&9 1.1.10 so
25 932 hi. 81:0 Id.- ~58
3'3 910 1.1;.2 835 1.5.5 ~75
to 900 ““5? 650 1.7 «coo

 

 

 

Titretionoffietlviuefilne inlceticicidll in
Perchloric Acid with Titenone Sulfate

   

 

121. ”volt Kl. Wt 141. Mt
0 250 35.1 130 37.2 60
S 200 ~ 35 .9 129 37.3 4.0

10 185 36 125 31.5 4.8

15 175 36.2 121 37.7 «SD

20 170 36$ 119 33.8 «55

25 162 36.8 105 3

35 138 37 90 ~85

75 1.2 .100

I
I
I

 

 

 

I
I
I
I
I
I
I
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23

Titretim of Ferric Chloride Iith 21m Suliete

 

 

 

 

 

 

 

 

0 31.0 g 275 33 210
2 315 260 ll. 18
3 292 9 260 15 170
I. 285 10 259 16 150
S 280 11 21.5 13 120
6 280 12 230 22 80
Titration of We in Acetic Acid 1 II in
Respect to Snlglmric Acid with Titenoue Suli‘ete
m. molt El. limit El. molt
0 375 26 318 21.6 2R)
l 370 26.2 312 27.8 80
2 355 26.1. 310 20
5 350 26.6 308 28.2 ~55
10 31.5 26.8 305 28.1. .62
15 31.0 21 300 29 ~75
20 335 21.2 290 30 ~90

 

TitntionotswmmahtetithCeIVinPremeot
mtrc-o-ththroline-Forrme Complex ee en Indicetor

‘kh -—— A A -___-. . ,

r A wuaflm V'—v—a-‘Q'v-nn-“um-—\M~mm”-..aum--

10.. Mt

 

  

 

 

 

 

 

 

m. belt no. wait

0 61.0 23 720 25.85 885

S 660 21. 730 26 111.0
10 680 25 71.0 26.1. 1185
15 690 25 .3 71.5 21 1210
20 710 25 .5 750 30 1250
21 112 25 g 760 35 1270
22 715 25- 790

I

 

Titration at {trams Mata with Potassium Wt.

   

 

Ml . “701% El. Walt H1. 3701‘!
0 .150 23 235 213.5 600
10 450 23 .1 270 a .8 620
15 'I- f 23 .3 31,35 25 65:5
20 ~120 23 5 3 £11 25 .5 730
22 .. 89 23.7 1.50 26 750
22 oh .- 65 23 «9 500 27 790
22 06 " 1«$5 23801 533.0 29 810
22 .8 DO 2!; .3 590 31 {330

Titration of Cerium IV with Sodium Doubts in
Acetic Acid 1 E in thloric Acid

— “re—W... M “awn-a.— ....-.....—.----. ‘1... . .-..'

 

     

 

 

 

141. m1: 141. Hmlt m. molt
o 810 15.8 1300 17 780
3 1270 16 1160 11.5 770
5 1280 16.2 950 1.9 760

m 1280 16.}; 660 25 750

15 125 16.6 810 so 720

15.5 1230 16.8 8-30

 

 

38

20

"5

”8
w ”0
N m3
U I