Redox Reactions

Step 1: Assign oxidation states.
In (oxygen difluoride), fluorine is more electronegative and has each. Let O be :
.
Step 2: Eliminate others.
Cl O: O is (Cl is ).
Na O : Peroxide, O is .
Na O: Oxide, O is .
Step 3: Conclusion.
Only F O has oxygen in the state.

Aim.
To determine the molarity of the given KMnO solution using Mohr's salt solution (Fe ).
Apparatus.
Burette, conical flask, pipette, Bunsen burner, test tube, HCl, H SO , Mohr's salt solution.
Procedure.
1. Fill the burette with the KMnO solution.
2. Take a known volume of Mohr’s salt solution (Fe ) in a conical flask.
3. Add a few drops of dilute H SO to provide H for the reaction.
4. Titrate the KMnO solution into the Mohr’s salt solution while stirring continuously.
5. A persistent pink color will appear near the endpoint. This indicates that all the Fe has reacted, and the endpoint is reached.
6. Note the volume of KMnO used.
Calculation.
Using the equation: Where: - = Molarity of KMnO - = Volume of KMnO used in titration - = Molarity of Mohr's salt solution - = Volume of Mohr's salt solution used in titration Since the balanced reaction between KMnO and Mohr's salt is: The molar ratio between KMnO and Fe is 2:5.

Aim.
To determine the molarity of the given KMnO solution using oxalic acid solution by volumetric analysis.
Apparatus.
Burette, conical flask, pipette, Bunsen burner, test tube, H SO , oxalic acid solution.
Procedure.
1. Fill the burette with the KMnO solution.
2. Prepare a known volume of oxalic acid solution in the conical flask.
3. Add a few drops of dilute H SO to the flask to provide H for the reaction.
4. Titrate the KMnO solution into the oxalic acid solution while stirring continuously.
5. A persistent pink color will appear near the endpoint. This indicates that the reaction is complete.
6. Note the volume of KMnO used.
Calculation.
Using the equation: Where: - = Molarity of KMnO - = Volume of KMnO used in titration - = Molarity of oxalic acid solution - = Volume of oxalic acid solution used in titration Since the balanced reaction between KMnO and oxalic acid is: The molar ratio between KMnO and oxalic acid is 2:5.