Potassium Oxalate Titration Mass Calculator

Calculator Input

KMnO4 Molarity, mol/L

Single Titre Volume, mL

Blank Volume, mL

Standardization Factor

Aliquot Volume, mL

Final Flask Volume, mL

Extra Dilution Multiplier

Purity Correction, %

Molar Mass, g/mol

Use 166.2156 for anhydrous K2C2O4. Use 184.2309 for monohydrate.

Sample Mass, g

Optional. Used only for assay percentage.

Replicate Titres, mL

Separate values by commas, spaces, or new lines.

Formula Used

In acid solution, permanganate oxidizes oxalate. The balanced ionic equation is:

2MnO₄^- + 5C₂O₄^2- + 16H⁺ = 2Mn²⁺ + 10CO₂ + 8H₂O

Therefore, 2 moles of KMnO₄ react with 5 moles of oxalate ion. One mole of K₂C₂O₄ contains one mole of oxalate.

Corrected titre = Average titre - Blank titre

Moles KMnO₄ = Molarity × Standardization factor × Corrected titre in liters

Moles K₂C₂O₄ in aliquot = Moles KMnO₄ × 5 / 2

Total moles = Aliquot moles × Final flask volume / Aliquot volume × Extra dilution

Mass = Total moles × Molar mass

Purity corrected material mass = Pure mass ÷ Purity fraction

How To Use This Calculator

Enter the standardized KMnO₄ molarity.
Enter one titre, or enter several replicate titres.
Add the blank titre if a blank correction was performed.
Enter the aliquot volume and final flask volume.
Keep extra dilution as 1 if no added dilution exists.
Enter the molar mass for the required potassium oxalate form.
Enter sample mass only when assay percentage is needed.
Press calculate. The result appears above the form.
Use the export buttons to save a report.

Example Data Table

KMnO4 M	Titre mL	Blank mL	Final mL	Aliquot mL	Molar Mass	Estimated Mass
0.0200	24.60	0.10	250	25	166.2156	2.0361 g
0.01985	22.30	0.05	250	25	166.2156	1.8357 g
0.0200	18.75	0.00	100	20	184.2309	0.8636 g

About Potassium Oxalate Mass From Permanganate Titration

Why This Calculation Matters

Potassium oxalate can be determined by titration with potassium permanganate in acid medium. The reaction is useful because permanganate has a strong color. The endpoint is usually seen as a faint permanent pink shade. A clear endpoint gives a reliable relation between oxidant and oxalate. This calculator converts that endpoint volume into the mass of K₂C₂O₄. It also handles common laboratory corrections. These include blank volume, dilution, aliquot size, molar mass, and purity.

What The Inputs Mean

The molarity field should contain the standardized concentration of KMnO₄. The standardization factor can correct a label value. Use 1.0000 when the entered molarity is already final. The titre volume is the burette volume used at the endpoint. Replicate titres improve confidence. If replicate values are entered, the calculator averages them. The blank volume removes reagent used by impurities or background reaction. The corrected titre is then used for stoichiometry.

Dilution And Mass Basis

Many samples are dissolved in a volumetric flask. Only a measured aliquot is titrated. The final flask volume divided by aliquot volume scales the aliquot result. Extra dilution covers any additional transfer or dilution step. The molar mass field lets you select the correct substance basis. Anhydrous K₂C₂O₄ and hydrated material do not have the same molar mass. The purity field reports how much material would contain the pure calculated amount.

Good Laboratory Practice

Warm acidic oxalate solutions are often titrated to help the reaction proceed smoothly. The first permanganate additions may react slowly. Near the endpoint, add titrant dropwise. Swirl the flask after each addition. Record concordant titres. Reject rough values when justified by lab rules. Always use the same units throughout the calculation. The result is only as accurate as the standard solution, endpoint reading, and dilution records.

FAQs

1. What reaction is used in this calculator?

It uses the acidic redox reaction between permanganate and oxalate. Two moles of permanganate react with five moles of oxalate. This ratio converts KMnO4 titre into K2C2O4 moles.

2. Why is the ratio five divided by two?

The balanced equation shows 5 oxalate ions for every 2 permanganate ions. So moles of oxalate equal moles of KMnO4 multiplied by 5/2.

3. Which molar mass should I use?

Use 166.2156 g/mol for anhydrous K2C2O4. Use 184.2309 g/mol for potassium oxalate monohydrate. Enter a custom value if your laboratory method specifies another basis.

4. What is the blank volume?

Blank volume is titrant consumed by background effects. It is subtracted from the sample titre. Enter zero if no blank titration was performed.

5. What does standardization factor mean?

It adjusts the entered permanganate molarity. For example, a factor of 0.998 makes the effective molarity slightly lower. Use 1.0000 when no correction is needed.

6. Why enter final and aliquot volumes?

A titration often uses only part of the prepared sample solution. The calculator scales the aliquot result back to the full flask volume.

7. Can I use replicate titres?

Yes. Enter replicate titre values separated by commas, spaces, or new lines. The calculator uses their average and reports standard deviation and RSD.

8. Does this replace a laboratory method?

No. It supports calculations only. Follow your approved procedure for heating, acid strength, endpoint rules, glassware, and acceptance limits.