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Question

0.1 N K2C2O4.3H2C2O4.4H2O solution reacts completely with 20 ml of 0.05 M KMnO4 solution in acidic medium. Another sample of the same solution of K2C2O4.3H2C2O4.4H2O having the same volume is titrated with 18 M NaOH solution. Then, the volume of NaOH solution (in ml) required for titration is:

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Solution

Redox titration
Eq. of K2C2O4.3H2C2O4.4H2O= Eq. of KMnO4
0.1×V1000=20×0.05×51000
V=50 ml
n factor of K2C2O4.3H2C2O4.4H2O
For redox titration =8
For acid base titration =6
for acid base titration normality of
K2C2O4.3H2C2O4.4H2O=0.18×6 N
Eq. of acid = Eq. of base
0.1×508×1000×6=18×V ml1000
V ml=30 ml

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