Oxalic Acide Back titration

What is the chemical formula for oxalic acid?

• 
  H₂SO₄

• HCl

• H₂C₂O₄

• HNO₃

What is the reaction rate of MnO₄⁻ with Fe²⁺ at room temperature?

• 
  Very slow

• Moderate

• Very fast

• Non-reactive

What is the purpose of adding FAS solution during the titration?

• 
  To dissolve the oxalate

• To act as a catalyst

• To change the solution color from pink to colorless

• To increase the acidity

What is the final color change indicating the endpoint of the titration?

• 
  Blue to green

• Yellow to orange

• Pale pink to colorless

• Red to pale pink

What should you do with chemicals after an experiment?

• 
  Leave them on the table

• Place all chemicals in the appropriate waste container

• Pour them down the sink

• Store them in a random cabinet

What should be included in your report according to the document?

• 
  Only the final results

• Key results and purity of the sample

• Only the sources of error

• Just the calculations

What is the normality of the KMnO₄ solution calculated in the example?

• 
  0.0953

• 0.0853

• 0.1053

• 0.1153

What is the total volume of KMnO₄ added in the titration process?

• 
  43.8 ml

• 40.0 ml

• 38.0 ml

• 45.0 ml

What is the calculated purity percentage of Na₂C₂O₄ in the sample?

• 
  13.62%

• 12.62%

• 14.62%

• 15.62%

What is the formula used to calculate the purity of the sample?

• 
  Mₓ = N × V₁ × EW

• Mₓ = N × V₂ × EW

• Mₓ = N × V₃ × EW

• Mₓ = N × V₄ × EW