How do you calculate iodometric titration?

Procedure

1. Weigh to the nearest 0.1 mg an amount of H2O2 equivalent to a titer of 30 mLs (0.06 grms of H2O2) using a 5 mL beaker and medicine dropper.
2. Add to Erlenmeyer flask 50 mL of demineralized water, 10 mL of sulfuric acid solution, 10-15 mLs of potassium iodide solution, and two drops ammonium molybdate solution.

Why do we use 0.025 N sodium thiosulphate solution for the titration?

hydroxide forming a mixture of higher, oxides (brown colour compound), which on acidification in the presence of an iodide, release iodine in a quantity chemically equivalent to the oxygen content of the water sample. The liberated iodine is then titrated with a standard solution of sodium thiosulphate.

What indicator is used in the titration of iodine with sodium thiosulphate?

starch indicator
Principles of method The iodine released is titrated using sodium thiosulphate at a known concentration with a starch indicator (blue colour).

How do you standardize sodium thiosulfate?

Standardization of sodium thiosulphate. Dissolve 0.125 g of accurately weighed potassium dichromate in 25 ml of water present in a 250 ml erlenmeyer flask. Add 10 ml of hydrochloric acid and 2 g of potassium iodide , stopper, shake and keep in dark for 15 min. Add 100 ml of water to the above mixture and titrate with sodium thiosulphate using starch…

Is sodium thiosulfate a reducing agent?

Sodium thiosulfate is readily soluble in water and is a mild reducing agent. Because it dissolves silver salts, its major use is in photography for developing film. It is also used in chrome-tanning leather and in chemical manufacture.

What is the preparation of sodium thiosulfate?

The laboratory preparation of the sodium thiosulfate salt involves the heating of aqueous sodium sulfite solutions along with sulfur. The production of Na2S2O3can also be accomplished by the boiling of aqueous NaOH (sodium hydroxide) with sulfur. The reaction for the method described above is given by

How is sodium thiosulfate prepared?

Take 25 g of sodium thiosulfate pentahydrate (Na2S2O3·5H2O) in 500 mL of freshly boiled and cooled water