1.

A solution of Na_(2)S_(2)O_(3) is standardised iodometrically against 3.34 g of pure KBrO_(3) (converted to Br^(-)), requiring 40 mL Na_(2)S_(2)O_(3) solution. What is the molarity of Na_(2)S_(2)O_(3) solution ? (Molar mass of KBrO_(3)=167 g "mol"^(-1))

Answer»


Solution :Necessary equations :
`KBrO_(3)+KIrarrI_(2)Br^(-)`
`I_(2)+Na_(2)S_(2)O_(3)rarrNa_(2)S_(4)O_(6)+`NAL
equivalent of `I_(2)` = equivalent of `KBrO_(3)=12XX10^(-2)`
equivalent of `Na_(2)S_(2)O_(3)=`equivalent of `KBrO_(3)=12xx10^(-2)`
equivalent of `Na_(2)S_(2)O_(3)`=equivalent of `I_(2)`
`Mxx1xx(40)/(1000)=12xx10^(-2)`
so MOLARITY = 3M.


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