Study Set Content:
Both methods use Starch TS as indicator but differs to when
this will be added:
○ at the start for
Iodimetry
Both methods use Starch TS as indicator but differs to when
this will be added:
○ at the start for Iodimetry
(colorless to deep blue/ violet)
before the endpoint for
Iodometry
before the endpoint for Iodometry
(discharge of deep blue/
violet color)
Sample Assays:
Iodimetry
Direct: Ascorbic Acid, Tartar Emetic – using 0.1N I2 VS
Iodine, Strong iodine solution – using 0.1N As2O3
Sample Assays:
Iodimetry
Residual: NaHSO3, Na2SO3, calomel, antipyrine
Sample Assays Iodometry
Iodometry
Direct: Cupric sulfate, Ferric sulfate, NaOCl solution
Residual: Phenol, Resorcinol
Reaction where there is an increase (+) in the oxidation no. as
that ion loses an electron.
Oxidation
Reaction where there is a decrease (-) in the oxidation no. as
that ion gains an electron.
Reduction
is an oxidized substance or substance that undergone oxidation. A substance that loses an electron.
Reducing agent
is a reduced substance or substance that undergone reduction. A substance which gains an electron.
Oxidizing agent
Standardization of 0.1N Potassium Permanganate
Primary standard
Sodium oxalate (Na2C2O4),
meq: 134g/mol/2000 = 0.067
Standardization of 0.1N Potassium Permanganate
Titrant
KMnO4
Standardization of 0.1N Potassium Permanganate
Indicator
None
Standardization of 0.1N Potassium Permanganate
Visual Endpoint
Pale pink color that persist for
15 seconds
Standardization of 0.1N Potassium Permanganate
Assay
Permanganometry
Standardization of 0.1N Sodium Thiosulfate
Primary Standard
Potassium dichromate
(K2Cr2O7), mEq:
294g/mol/6000 = 0.049
Standardization of 0.1N Sodium Thiosulfate
Titrant
Na2S2O3
Standardization of 0.1N Sodium Thiosulfate
Indicator
Starch TS
Standardization of 0.1N Sodium Thiosulfate
Visual End point
Discharge of deep blue/violet
color
