Sodium thiosulphate, Na(2)S(2)O(3)*5H(2)...

Sodium thiosulphate, `Na_(2)S_(2)O_(3)*5H_(2)O` is used in photography to:

Reduce the silver bromide to metallic silver

Convert the metallic silver to silver salt

Reduce undecomposed AgBr as soluble silver thiosulphate complex

Remove reduced silver

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Na_2S_2O_3. 5H_2O is used in photography to

12. g of an impure sample of arsenious oxide was dissolved in water containing 7.5 g of sodium bicarbonate and the resulting solution was diluted to 250 mL . 25 mL of this solution was completely oxidised by 22.4 mL of a solution of iodine. 25 mL of this iodine solution reacted with same volume of a solution containing 24.8 g of sodium thiosulphate (Na_(2)S_(2)O_(3).5H_(2)O) in one litre. Calculate teh percentage of arsenious oxide in the sample ( Atomic mass of As=74 )

Na_(2) CO_(3). 10 H_(2) O is

Na_(2)S_(2)O_(3) is prepared by :

Oxidation number of sulphur in Na_(2)S_(2)O_(3) is

In the test for iodine, I_(2) is treated with sodium thiosulphate (Na_(2)S_(2)O_(3)) : Na_(2)S_(2)O_(3)+I_(2) to NaI +..

Na_(2)S_(2)O_(3) is oxidized by I_(2) to give

Sodium sulphite Na_(2)SO_(3)+HCl to_____ +H_(2)O+_________

Free iodine is titrated against standard reducing agent usually with sodium thiosulphate , i.e. K_(2)Cr_(2)O_(7) + 6Kl + 7H_(2)SO_(4) to Cr_(2)(SO_(4))_(3) + 4K_(2) SO_(4) + 7H_(2)O+l_(2) 2CuSO_(4) + 4Kl to Cu_(2)l_(2) + 2K_(2)SO_(4) + l_(2) l_(2) + Na_(2)S_(2)O_(3) to 2Nal + Na_(2)S_(4)O_(6) In iodometric titration, starch solution is used as an indicator. Starch solution gives blue or violet colour with free iodine .At the end point , blue or violet colour disappears when iodine is completely changed to iodide. 50 ml of an aqueous solution of H_(2)O_(2) was treated with excess of Kl in dil. H_(2)SO_(4) . The liberated iodine required 20 ml of 0.1 N Na_(2)S_(2)O_(3) for complete reaction. The concentration of H_(2)O_(2) is

Sodium thiosulphate soln . Na_(2)S_(2)O_(3)+HCl to .......... +...........+...........+............

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