ANALISIS-IODIMETRY2

8/7/2019 ANALISIS-IODIMETRY2

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Serenity Nerds 2010

IODIMETRY


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The Members

Definition of

Iodimetry

How to MakeI2 Solution

Standardization of I2

Conclusion

References

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The Members

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20. Raden Achmad H.K

21. Rania Fardyani

22. Rima Amalia 23. Siti Aisyah

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Definition of

Iodimetry


Standarization of I2

Conclusion

References

19. NurWulan Fiany


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Definition of

Iodimetry

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WHATIS IODIMETRY?

Iodimetry is one of red-ox titration

method that oxidizes compound when

the reagent and the sample react.

This method is a direct titration because

the sample directly reacts with theiodine (I2).

KMnO4 I2

Oxidator

I- Fe2+

Reductor



Conclusion

References

The Members The sample will react directly with iod

solution, and then the rest of iod will

be titrated by Sodium Tio Sulphate

In this case, we use starch as the

indicator because the end-point was

not clear without it.

End-point without starch to

End-point with starch fromblue to

colorless

slightly yellow

PRINCIPE


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20g of KI p.a 30-40ml of water

E.A 1L

1.27g of iod p.ashaked

Do not weigh iodinewith

analytical balance,

becauseiodinewill

condense quicklywhen

interactswith air!

CovertheErlenmeyer

immediatelyto minimize

airtoErlenmeyer!

PuttheIodium indark bottle

to prevent HIO

decomposition bylightsun.


P

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TheadditionofKIisto

increasesolubilityinwater

anddecreaseevaporation

ofiodium


Conclusion

References

The Members

Definition of

Iodimetry


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As2O3

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PRINCIP

EIn neutral condition, As2O3 are oxidized by I2. Reaction thathappened is reversible but can be moved to right. HI thatformed as soon as possible is taken from addition of NaHCO3.End-point are obtained from colorless becomes blue with starch

indicator.

REACTIO

NAs2O3 + 2H2O + 2I2 4HI + As2O5HI + NaHCO3

NaI + CO2 + H2O

PROCED

URE

1g ofAs2O3 V.F 250ml

Conclusion

References

The Members

Definition of

Iodimetry


PP

10ml of

NaOH 4N

3g of

NaHCO3H2SO4

10ml

starch


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PRINCIP

EI2 are oxidized by Na2S2O3until the solution becomes slightlyyellow. The titration stopped and starch added into solution.The titration continued until the solution becomes colorless asthe end-point.

REACTIO

NI2 + Na2S2O3 2NaI + Na2S4O6

PROCED

URES

E 250ml

25ml of I2

andarization of I2

As2O3

Na2S2O

3

Conclusion

References

The Members

Definition of

Iodimetry



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Iodimetry isoneofred-ox

titration methodthatoxidizes

compoundwhenthereagentandthesamplereact.

This methodisa directtitration

becausethesample directly

reacts with theiodine (I2).

I2 can bestandarizedwith using

As2O3 and Na2S2O3

I2 solutionwas made bydilutteI2p.a. In KI becausevapor

pressureI2 in KIissmallerthan

I2 inwater



References

The Members

Conclusion

Definition of

Iodimetry?


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J.Bassett, dkk. 1994. Buku Ajar Vogel,

Kimia Analisis Kuantitatif Kimia.

Jakarta : EGCSulistiowati, dkk. 2009. Analisis Volumetri.

Bogor: Departemen Perindustrian

Pusdiklat Indistri SMAKBO

Oxford University. 2005. Oxford Learners

Pocket Dictionary. China : Oxford

University Pressen.wikipedia.org

www,google.com

www.ecplaza.net



The Members

Definition of

Iodimetry

References

Conclusion


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ANALISIS-IODIMETRY2

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