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)
- 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
Make sure you also check our other amazing Article on: Primary and Secondary Standards