Preparation of 0.1M Potassium Dichromate

 

Preparation of 0.1M Potassium Dichromate

 

Molecular Formula:  K2Cr2O7

Molecular weight: 294.18

 

Preparation

:

Dissolve 4.903 g of Potassium Dichromate transfer into a 1000ml volumetric flask then volume up to 1000 ml with Deionize water.

Standardization

:


·         Transfer 25.0 mL of this solution to a glass-stoppered into a 500-mL flask

·         add 2 g of potassium iodide (free from iodate)

·         dilute with 200 mL of water,

·         add 5 mL of hydrochloric acid,

·         allow to stand for 10 minutes in a dark place

·         adding 3 mL of starch TS as the endpoint is approached

·         titrate the liberated iodine with 0.1 N sodium thiosulfate VS

·         Carry out a blank determination.

 

Calculation

:

N

=

ml Na2S2O3 x N Na2S2O3

25.0

Reference

:

USP

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