determination of the oxalate content in k2 cu(c2o4)2 .2h2o,
during standardization of permanganate solution using sodium oxalate,
can the titration between Mno4- and C2o42- at 25degree celcius be perform?
I don't know what the first paragraph has to do with the other two.
Yes, permanganate and oxalate can be titrated but it is extremely slow at the beginning. Mn^2+ seems to catalyze the reaction so the reaction is much faster after some Mn^2+ have been formed.
Yes, the titration between MnO4- and C2O42- can be performed at 25 degrees Celsius. The reaction between them is commonly known as a redox reaction. Here is a step-by-step explanation of the process:
1. To standardize the permanganate (MnO4-) solution, you need a known concentration of sodium oxalate (Na2C2O4).
2. Take a known mass of sodium oxalate (previously dried to remove any water content) and dissolve it in a measured volume of distilled water to make a solution. The exact mass and volume will depend on the concentration desired.
3. Prepare the permanganate solution by dissolving a known mass of KMnO4 in distilled water. Again, the specific mass will depend on the desired concentration.
4. Perform a trial titration to determine the approximate volume of permanganate solution needed to reach the endpoint. This will help estimate the volume required for subsequent titrations.
5. Pipette a diluted aliquot of the sodium oxalate solution into a conical flask. The diluted aliquot should contain about 0.1-0.3 grams of sodium oxalate.
6. Add a few drops of sulfuric acid (H2SO4) to the flask to make the solution slightly acidic. The acid helps to stabilize the MnO4- as it is reduced.
7. Titrate the sodium oxalate solution by slowly adding the permanganate solution from a burette. The permanganate solution should be added dropwise near the endpoint, which is signaled by a persistent pink color.
8. Continue adding the permanganate solution until the pink color remains for about 30 seconds, indicating the completion of the reaction.
9. Record the volume of permanganate solution used for the titration.
10. Repeat the titration procedure two or three times to ensure accurate results. Calculate the average volume of permanganate solution used.
11. Finally, use the average volume and the known concentration of permanganate solution to determine the exact concentration of the sodium oxalate solution.
It is important to note that the exact procedure may vary slightly based on the specific requirements of your experiment or laboratory guidelines.
To determine the oxalate content in K2Cu(C2O4)2·2H2O, you would first need to perform a titration using a standard permanganate solution and sodium oxalate as the titrant.
The titration involves the reaction between KMnO4 (potassium permanganate) and Na2C2O4 (sodium oxalate). The balanced equation for this reaction is:
2MnO4- + 5C2O4^2- + 16H+ -> 2Mn2+ + 10CO2 + 8H2O
To determine if the titration can be performed at 25 degrees Celsius, you need to consider the reaction kinetics. The reaction rate generally increases with temperature. However, the reaction between permanganate and oxalate is relatively slow even at higher temperatures. Therefore, the rate of reaction may be too slow at room temperature to yield accurate and precise results.
To ensure a reliable titration, it is generally recommended to perform the titration at an elevated temperature, typically around 75-80 degrees Celsius. At this temperature, the reaction between permanganate and oxalate proceeds at a reasonable rate, allowing for accurate determination of the oxalate concentration.
In summary, while it is technically possible to perform the titration between MnO4- and C2O42- at 25 degrees Celsius, the reaction rate may be too slow to obtain accurate results. Therefore, it is recommended to perform the titration at an elevated temperature around 75-80 degrees Celsius.