Weight of iodine required to oxidise 500...

Weight of iodine required to oxidise 500 mL N `Na_(2)S_(2)O_(3)` solution, is :

6.35 g

63.5 g

127 g

254 g

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50 mL of an aqueous solution of H_(2)O_(2) was treated with an excess of KI solution and dilute H_(2)SO_(4) . The liberated iodine required 20 mL 0.1 N Na_(2)S_(2)O_(3) solution for complete interaction. Calculate the concentration of H_(2)O_(2) in g//L .

To a 25 mL of H_(2)O_(2) solution, excess of acidified solution of KI was added. The iodine liberated required 20 mL of 0.3 N Na_(2)S_(2)O_(3) solution. Calculate the volume strength of H_(2)O_2 solution. Strategy : Volume strength of H_(2)O_(2) solution is related to its normality by the following relation Volume strength (V)=5.6xx"Normality" (N) where, Normality =((meq)H_(2)O_(2))/V_(mL) According to the law of equivalence (meq)_(Na_(2)S_(2)O_(3))=(meq)_(I_(2))=(meq)_(H_(2)O_(2))

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