Standarisasi Na-EDTA dengan Seng Sulfat Metode Titrasi Kompleksometri

Introduction

This tutorial provides a step-by-step guide on standardizing Na-EDTA using zinc sulfate through complexometric titration. Understanding this method is crucial for accurately determining metal ion concentrations in various chemical analyses. This guide will help you perform the titration process methodically, ensuring precise results.

Step 1: Weighing Zinc Sulfate

• Begin by measuring the appropriate amount of zinc sulfate needed for your experiment.
• Use a digital balance for accurate weighing.
• Ensure the balance is calibrated before use.

Step 2: Dissolving Zinc Sulfate

• Prepare a buffer solution with a pH of 10.
• To dissolve zinc sulfate:
  • Add the weighed zinc sulfate to a beaker.
  • Gradually pour the buffer solution into the beaker while stirring until the zinc sulfate is fully dissolved.
• This step is essential for maintaining the correct pH during titration.

Step 3: Adding the Indicator

• Introduce EBT (Eriochrome Black T) as an indicator:
  • Add a few drops of EBT to the dissolved zinc sulfate solution.
  • The presence of the indicator will help visualize the titration endpoint.

Step 4: Conducting the Titration

• Set up your titration apparatus:
  • Place the zinc sulfate solution on a magnetic stirrer to ensure continuous mixing.
  • Fill the burette with the Na-EDTA solution.
• Begin the titration:
  • Slowly add Na-EDTA to the zinc sulfate solution while stirring.
  • Watch for a color change in the solution, which indicates the endpoint has been reached.

Step 5: Calculation of Results

• After reaching the endpoint, note the volume of Na-EDTA used.

• Use the following formula to calculate the concentration of the zinc sulfate solution:

  C1V1 = C2V2
  

  Where:

  • C1 = concentration of zinc sulfate
  • V1 = volume of zinc sulfate solution
  • C2 = concentration of Na-EDTA
  • V2 = volume of Na-EDTA used

Conclusion

In this tutorial, we've covered the process of standardizing Na-EDTA using zinc sulfate via complexometric titration. Key steps include weighing the zinc sulfate, preparing the buffer, adding the indicator, conducting the titration, and calculating results. Ensure you follow each step carefully for accurate measurements. As a next step, consider exploring additional titration methods or experimenting with different metal ions for further practice.