Preparation and Standardization of Oxalic Acid (0.1m)

Oxalic Acid (0.1M) 

Molecular formula: H2C2O4 ⋅ 2H2O = 126 

Molecular weight: 90.03 

Preparation: Dissolve 6.3 g of oxalic acid in sufficient water to produce 1000 mL. 

Standardization: Pipette 25 mL of the 0.1M NaOH and transfer it into a clean conical flask,  to it add 2-3 drops of phenolphthalein indicator and titrate with 0.1N oxalic acid solution until color changes from purple to colorless. 


H2C2O4(aq)  + 2NaOH(aq) → Na2C2O4(aq) + 2 H2O(l) 

Factor Calculation: 

  • 1 mole of oxalic acid ≅ 2 moles of sodium hydroxide 
  • 1000 mL of 1M H2C2O4 ≅ 80 g of NaOH 
  • 1000 mL of 1M H2C2O4 ≅ 40 g of NaOH 

1 mL of 0.1 M H2C2O2.2H2O ≅ 0.0040 g of NaOH

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