11nyc question but im not able to make out the reactions occuring in this question...how does mno2 react with oxalic acid
Q) 2.6g sample of pyrolusite was boiled with 65ml of N oxalic acid and excess of dil. H2SO4. The liquid was then filtered and the residue washed. The filtrate and the washing were mixed and made upto 500ml. 100ml of this soln required 50ml of N/10 KMnO4. Calculate %purity of pyrolusite.
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11
11+2 to +4 ??
shouldn't it be +3 (in oxalic acid) to +4(maybe in co2)
1mili eq of acid added=65
mili eq of acid left after oxidation in 500 ml=25
mili eq of acid used=mili eq of MnO2=40
n factor of MnO2=2
w=40*(87/2)*(1/1000)=1.74g
% purity=w/2.6*100= 67%(approx.)