248 g of sodium thiosulfate nazs2o3sh20 are dissolved in one litre of distilled water 1 weigh ac

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24.8 g of sodium thiosulfate (Na2S2O3Â·5H2O) are dissolved in one liter of distilled water. 1) Weigh accurately 4.9 g of K2Cr2O7. i) 0.1 N of potassium dichromate (K2Cr2O7) dissolved in one liter of distilled water. iii) 10% (w/v) potassium iodide (KI) (make up just prior to use). Starch solution: 10 g of soluble starch and a pinch of mercuric iodide are suspended in 30 mL of distilled water, and the suspension is added to one liter of boiling water. The whole mixture is maintained at a boil for 3 minutes and then allowed to cool. iv) Titration (to be carried out in triplicate): 50 mL of water, 15 mL of potassium iodide, 25.0 mL of 0.1 N potassium dichromate, and 4 mL of concentrated HCl are placed in a 250 mL glass-stoppered flask, shaken, and allowed to stand in the dark for ten minutes. The mixture is then titrated with sodium thiosulfate solution. When the yellow iodine color has clearly lightened in color (shake vigorously, note that the solution turns amber on standing), add 1.0 mL of starch solution and continue adding sodium thiosulfate until the color has changed to blue and then to turquoise or "sea green" (chromic ions). Reactions: K2Cr2O7 + 6 KI + 14 HCl â†’ 8 KCl + 2 CrCl2 + 3 I2 + 7 H2O

          24.8 g of sodium thiosulfate (Na2S2O3Â·5H2O) are dissolved in one liter of distilled water.

1) Weigh accurately 4.9 g of K2Cr2O7.
i) 0.1 N of potassium dichromate (K2Cr2O7) dissolved in one liter of distilled water.
iii) 10% (w/v) potassium iodide (KI) (make up just prior to use).
Starch solution: 10 g of soluble starch and a pinch of mercuric iodide are suspended in 30 mL of distilled water, and the suspension is added to one liter of boiling water. The whole mixture is maintained at a boil for 3 minutes and then allowed to cool.
iv) Titration (to be carried out in triplicate):
50 mL of water, 15 mL of potassium iodide, 25.0 mL of 0.1 N potassium dichromate, and 4 mL of concentrated HCl are placed in a 250 mL glass-stoppered flask, shaken, and allowed to stand in the dark for ten minutes. The mixture is then titrated with sodium thiosulfate solution. When the yellow iodine color has clearly lightened in color (shake vigorously, note that the solution turns amber on standing), add 1.0 mL of starch solution and continue adding sodium thiosulfate until the color has changed to blue and then to turquoise or "sea green" (chromic ions).

Reactions:
K2Cr2O7 + 6 KI + 14 HCl â†’ 8 KCl + 2 CrCl2 + 3 I2 + 7 H2O

248 g of sodium thiosulfate nazs2o3sh20 are dissolved in one litre of distilled water 1 weigh accurately 49 g of kzcrzov i 01 n of potassium dichromate kzcrzov dissolved in one litre of dist 48263

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