1no of equi : 0.11 X 50 / 1000
weight of Mno2 = (56+32)/2 X no. of equi.
this weight
------------------ = purity
given wt.
0.25g sample of MnO2 is dissolved in HCl soln. and distillate passed through iodine soln. .The iodine thus liberated reqd 50mL 0.11N thiosulphate soln. Calculate purity of MnO2.
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9 Answers
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1ohhhh sorry, u r right,
actually i have taken molecular wt. of Mn as 57 instead 56, method is same
& thats totally a foolish mistake
24So u all too are getting it in range of 90%......................mee the same toooo....but ans is 60%