Sodium thiosulphate is oxidised by iodine to sodium tetrathionate. Calculate equivalent weight of sodium thiosulphate. (Na=23, S=32, O=16).

In the reaction of sodium thiosulphate with I_(2) in aqueous medium the equivalent weight of sodium thiosulphate is equal to

Iodine reacts with sodium thiosoulfate in a neutral medium .Write the balanced equation of this reaction . Calculate equivalent mass of sodium thlosulfate in this reaction . (Assume molecule mass of sodium thiosulfate=M).

The density of a 3M sodium thiosulphate (Na_2S_2O_3) solution is 1.25 g/mL. Calculate the percent by weight of sodium thiosulphate.

An excess of acidic KI solution is added to 25 mL of a H_(2)O_(2) solution when iodine is liberated. 20 mL of 0.1 (N) sodium thio-sulphate solution is required to titrate the liberated iodine. Calculate the percentage strength, volume strength and strength in normality of the H_(2)O_(2) solution.

Iodine oxidises sodium borohydride to give-

2.5 g of an inpure sample of sodium bicarbonate when strongly heated gave 300ml of carbondioxide measured at 27^(@) and 760 mm pressure. Calculate the percentage purity of the sample. (Na=23, C=12, O=16).

To a 25 ml H_2O_2 solution, excess of acidified solution of potassium iodide was added. The iodine liberated required 20 mL of 0.3 N sodium thiosulphate solution. Calculate the volume strength of H_2O_2 solution.

Find out the oxidation state of sodium in Na_2O_2 .

Find the oxidation state of sodium in Na_2O_2

Calculate the percentage composition (by mass) of the constituent elements of sodium sulphate (Na_(2)SO_(4)) .