How to prepare and Standardize 0.1 N Zinc Sulfate Volumetric solution.
➤ Glass ware and instruments required.
Beaker, Glass stirrer, Graduated Pipettes, Graduated cylinder, Analytical balance, Sucker, Volumetric flask, Fume hood.
➤ Reagents required.
Zinc Sulfate
Molecular Wt. :- ZnSO4,7H2O ,287.53
Edeatate disodium VS
Dithiozone Solution Indicator
➤ Preparation.
Weigh 29 g zinc sulfate reagent grade in 1000 ml volumetric
flask. Dissolve in sufficient water by warming, cool and dilute up to the mark
with water. Filter the solution, if it is not clear.
➤ Standardisation.
Pipette out 25 ml of 0.05 M
Edeatate disodium VS in to a 250 ml conical flask, and add, in the order given,
25 ml of acetic acid-ammonium acetate buffer solution, 50 ml of alcohol, and 2 ml of dithizone solution.
Titrate with the 0.1 M zinc sulphate
solution to clear, rose-pink colour. Note this final end point as burette
reading in ml.
➤ Calculations.
ml, Edeatate disodium x Molarity of
Edeatate disodium
M =
-----------------------------------------------------------------------
ml, ZnSO4
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