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ADNAN MUHAMMED

Grade 12,

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A mixture of NaHC2O4 and KHC2O4.H2C2O4 require equal volumes of 0.2N KMnO4 and 0.12N NaOH separately. what is the molar ratio of NaC2O4 and KHC2O4.H2C2O4 ?

A mixture of NaHC2O4 and KHC2O4.H2C2O4 require equal volumes of 0.2N KMnO4 and 0.12N NaOH separately. what is the molar ratio of NaC2O4 and KHC2O4.H2C2O4 ?

Grade:12th pass

1 Answers

Vikas TU
14149 Points
3 years ago
Steps:
1) In a mixture of Na2C2O4  and KHC2O4  ,only KHC2O4 will react with KOH. 
=> No. of milli  moles of KOH = No. of milli  moles of KHC204   (only 1 H) 
=>  100mL * 0.01 = n  
=> n=1 milli mole  of KHC2O4 . 
 2) As, No. of  milli mole of Na2C2O4   = No. of milli mole of  KHC204
=> No. of milli mole of Sodium Oxalate = 1 
 
3)Valency Factor of Sodium Oxalate and Potassium Hydrogen Oxalate is 2.  (each) 
Valency Factor of KMnO4 =5 :
 Now in Oxidation , both will be used due to C which is in +3 Oxidation state in both compounds .
=> No. of equivalents of Sodium Oxalate + No. of equvalents of Potassium Hydrogen Oxalate  =   No. of  equivalents of KMnO4  
=> 2*1 + 2*1 = 5*0.01 *V 
=> V= 20mL . 
Hence,Volume of Potassium Permangante used up is 20mL . 

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