Give the chemical reaction in standardizing Potassium dichromate using standardized Sodium thiosulfate. 0.1 N Potassium Dichromate Solution Preparation of 0.1 N Potassium dichromate (K2Cr207) Solution > Transfer 6 g of potassium dichromate (K2cr207) to a platinum dish and dry at 120°C for 4 h. Cool in a desiccator. > Place 4.9 g of the dried K2Cr207 in a 1-L volumetric flask, and > Add 100 ml of water. Swirl to dissolve and when solution is complete, dilute to the mark with water and mix. > Store the solution in a glass-stoppered bottle. Standardization of 0.1 N Potassium dichromate (K2Cr207) Solution > Place 40 ml of water in a 250-mL glass-stoppered conical flask. and > Add 40 mL, accurately measured, of the K2Cr207 solution. Stopper the flask, swirl to mix, remove the stopper, and > Add 3 g of potassium iodide (KI), 2 g of sodium bicarbonate (NaHCO3), and 5 ml of hydrochloric acid (HCI). > Stopper the flask quickly, swirl to ensure mixing, and let stand in the dark for 10 min. > Rinse the stopper and inner walls of the flask with water and titrate with freshly Standardized 0.1 N Sodium thiosulfate solution (Na2S203) until the solution is yellowish green. > Add 2 mL of starch solution (10 g/L), and continue the titration to the disappearance of the blue color.
Give the chemical reaction in standardizing Potassium dichromate using standardized Sodium thiosulfate. 0.1 N Potassium Dichromate Solution Preparation of 0.1 N Potassium dichromate (K2Cr207) Solution > Transfer 6 g of potassium dichromate (K2cr207) to a platinum dish and dry at 120°C for 4 h. Cool in a desiccator. > Place 4.9 g of the dried K2Cr207 in a 1-L volumetric flask, and > Add 100 ml of water. Swirl to dissolve and when solution is complete, dilute to the mark with water and mix. > Store the solution in a glass-stoppered bottle. Standardization of 0.1 N Potassium dichromate (K2Cr207) Solution > Place 40 ml of water in a 250-mL glass-stoppered conical flask. and > Add 40 mL, accurately measured, of the K2Cr207 solution. Stopper the flask, swirl to mix, remove the stopper, and > Add 3 g of potassium iodide (KI), 2 g of sodium bicarbonate (NaHCO3), and 5 ml of hydrochloric acid (HCI). > Stopper the flask quickly, swirl to ensure mixing, and let stand in the dark for 10 min. > Rinse the stopper and inner walls of the flask with water and titrate with freshly Standardized 0.1 N Sodium thiosulfate solution (Na2S203) until the solution is yellowish green. > Add 2 mL of starch solution (10 g/L), and continue the titration to the disappearance of the blue color.
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:Give the chemical reaction in standardizing Potassium dichromate using
standardized Sodium thiosulfate.
0.1 N Potassium Dichromate Solution
Preparation of o.1 N Potassium dichromate (K2Cr207) Solution
> Transfer 6 g of potassium dichromate (K2Cr207) to a platinum dish and dry at 120°C
for 4 h. Cool in a desiccator.
> Place 4.9 g of the dried K2Cr207 in a 1-L volumetric flask, and
> Add 100 mL of water. Swirl to dissolve and when solution is complete, dilute to the
mark with water and mix.
> Store the solution in a glass-stoppered bottle.
Standardization of 0.1 N Potassium dichromate (K2Cr207) Solution
> Place 40 ml of water in a 250-mL glass-stoppered conical flask. and
> Add 40 mL, accurately measured, of the K2Cr207 solution. Stopper the flask, swirl to
mix, remove the stopper, and
> Add 3 g of potassium iodide (KI), 2 g of sodium bicarbonate (NaHCO3), and 5 mL of
hydrochloric acid (HCI).
> Stopper the flask quickly, swirl to ensure mixing, and let stand in the dark for 10 min.
> Rinse the stopper and inner walls of the flask with water and titrate with freshly
Standardized 0.1 N Sodium thiosulfate solution (Na2S203) until the solution is
yellowish green.
> Add 2 mL of starch solution (10 g/L), and continue the titration to the disappearance
of the blue color.
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