Definition of IndicatorYodometri Indicator Kanji’s Indicator Example ofYodometri Titration
Definition of Indicator Indicator is a chemicalsubstrate that added into atitration which give a change ofcolor when the endpointreached. Indicator usually used ata reaction of titration thatthe change is invisible or
Yodometri Indicator Titration in yodometric actuallycan do without the addition ofindicator from outside because thecolor that produce by I2 thattitrated by Tio will be dissolvedwhen endpoint reached. Generally, first the change of the color is darkbrown, then become light brown, then turn intoyellow, light yellow, until in the end the color ofsolution will be disappear. When it observed, the color is
There are several types ofindicators may be used in redoxtitration. Among them are thespecific indicators, aresubstances that cause reactionsin a specific way with one of thereactants in the titration toproduce colors such as darkblue starch with iodine.
Kanji can be separatedinto two primarycomponents such amylose Amylose( ) which long and straightchain, is abundant in potatostarch , and gives blue colorwith Yod. And amylopectin Amylopectin( ) which has a long chainbut branched, and form a
In daily language, word“starch” always mixed with“flour” and also “kanji”.Starch is a primary compose offlour. Flour can be may notonly contain pure starch, it canbe mixed or blended withprotein, vitamins, and othermaterials contained in the
Co l o r e d c o mp l e xf o r ma t i o n me c h a n i s mi s n o t p r e c i s e l yk n o wn . Ho we v e r , t h ei o d i n e mo l e c u l e sa r e h e l d o n t h es u r f a c e o f a my l o s e , as t a r c h e l e me n t .E l e me n t s o f o t h e rs t a r c h a my l o p e c t i nf o r m a c o mp l e x t h a ti s r e d d i s h (v i o l e t )
The main advantage of kanji is cheap. But the disadvantages, such as:1. Insoluble in cold water2. Unstable suspense in water3. With Iod give a complex that insoluble in water, so kanji can’t be added in the beginning of the titration. Kanji can’t be added into a highly acidic medium because it can occurs hydrolysis of the kanji. And also the addition of the etanol 50% or more because the color
The Example Of Yodometri Titration Y o d o me t r i i st i t r a t i on wi t h r e d o xme t h o d . T h i st i t r a t i on i s i ndi r e c tt i t r a t i on, wh e r ene e de d ot h e rs ubs t a nc e be f o r et i t r a t e d wi t h T i os ol ut i on. An d t hi s i s a ne x a mp l e of s ubs t a nc e
Th i s p r o c e d u r e b a s eo n r e a c t i o n b e t we e nc h l o r a t a n d i o d i d e - - -w i t ClO 3 6I h c o n c Cl n 6H e t3Ir2 a 3HeO t 2 dc h l o r i d e a c i d :i o d t h a t p r o d u c e d a r et i t r a t e d wi t h Ti os o l u t i o n . I n o t h e r me t h o d e ,t h ClO 3 6Br - c 6H o r Cl - t 3Br 2 3Hs O i s- h l a i 2
Determination The Content of Cu (II) in CuSO4.5H2O by “De Haens” Way In acidic conditions, Cu (II) can be reduced to CuI2 which then decompose into Cu2I2 and I2. Thereafter, the free I2 titrated with Na2S2O3 (sodium thiosulfate) and starch indicator when approaching the endpoint. Cu (II) reduced by KI. The end point of this designation is from blue to colorless and milky white precipitate formed.
Determination of Normality of Na2S2O3 with BBP KIO3 In acidic conditions, can beoxidized by KIO3 KI to iodine (I2)that have free brown. Free I2 thentitrated with Na2S2O3 until aslight yellow color. The additionof starch as an indicator of theblue and make the solutionobtained colorless endpoint.
KIO 3 5KI 6HCl 6KCl 3I 2 3H 2OI2 2Na 2S2 O3 2 NaI Na 2S4 O 6