PRAKTIKUM ELEKTROKIMIA | Sel ELektrolisis dan Sel Volta

Summary

This script outlines a basic chemistry lab experiment focusing on electrochemistry. It covers the determination of reactions at the anode and cathode, observation of electrolysis events in potassium iodide solution, and measurement of cell potential. The procedure involves inserting electrodes, connecting them to a power source for 5 minutes, and observing changes at the electrodes. Indicators are added to the cathode chamber to note color changes. In a separate voltaic cell experiment, copper sulfate and zinc sulfate solutions are used with a salt bridge, and metals are inserted accordingly. The potential of the cell is measured and compared with calculated values. The session concludes with a reminder of the next meeting, emphasizing the educational value of the exercise.

Takeaways

• 🔬 The session is a chemistry lab practical titled 'Basic Electrochemistry Lab 2' focusing on electrolysis and voltaic cell experiments.
• 🔌 The objective is to determine the reactions at the anode and cathode, observe electrolysis events, and measure cell potential.
• 💧 The procedure starts with adding potassium iodide solution to a test tube up to about two centimeters from the mouth.
• 🔋 Electrodes are then inserted into the mouth of the test tube and connected to a power source for 5 minutes to observe changes at the electrodes.
• 💨 Bubbles or color changes at the anode and cathode are key observations indicating the electrolysis process.
• 🔍 Indicators such as phenolphthalein (pp) and amylum are added to the cathode chamber to observe color changes as a reaction indicator.
• 🔮 The next procedure involves a voltaic cell experiment where CuSO4 and ZnSO4 solutions are prepared in separate beakers.
• 🌉 A salt bridge made of filter paper is created to connect the two solutions, allowing for the flow of ions between them.
• 🔩 Metals corresponding to the solutions are inserted, and the resulting potential is measured using a multimeter.
• ⚖️ The measured cell potential is compared with calculated potentials using a formula, ensuring accuracy in the experiment.
• 📊 The results from the multimeter are compared with the calculated potentials to validate the findings of the experiment.
• 📚 The session concludes with a reminder for future meetings and a traditional greeting, emphasizing the educational and cultural context of the lesson.

Q & A

What is the title of the chemistry practical session described in the transcript?

The title of the chemistry practical session is 'Praktikum Elektrokimia Sel Elektrolisis dan Sel Volta'.

What is the main objective of the practical session mentioned in the transcript?

The main objective of the practical session is to determine the reactions at the anode and cathode, observe electrolysis events in a potassium iodide solution, measure cell potential, and compare the results with calculated potential.

What are the materials and equipment used in the practical session?

The materials and equipment used in the practical session can be seen in the video, but typically would include a potassium iodide solution, electrodes, a power source, and indicators such as phenolphthalein and amylum.

What is the first procedure described in the practical session for the electrolysis cell?

The first procedure is to insert the potassium iodide solution into a pipette tube up to about two centimeters from the mouth of the tube.

What should be done after inserting the solution in the electrolysis cell?

After inserting the solution, electrodes should be inserted into the mouth of the tube and connected to a power source for 5 minutes to observe changes at the anode and cathode.

What changes are expected to be observed at the anode and cathode during the electrolysis process?

One might expect to see the formation of bubbles or changes in color at the anode and cathode during the electrolysis process.

What is the purpose of adding phenolphthalein indicator to the cathode space?

The phenolphthalein indicator is added to observe any color change that may occur due to chemical reactions at the cathode.

What is the role of amylum indicator in the practical session?

Amylum indicator is added to observe color changes that may indicate the presence of starch or changes in the chemical composition of the solution.

What is the second procedure described in the practical session for the voltaic cell?

The second procedure involves adding 20 milliliters of CuSO4 solution and 20 milliliters of ZnSO4 solution into separate beakers and creating a salt bridge using filter paper.

How is the salt bridge created in the voltaic cell experiment?

The salt bridge is created by inserting filter paper saturated with salt into both solutions, allowing for the flow of ions between the two half-cells.

What is the final step in comparing the measured cell potential with the calculated potential?

The final step is to compare the measured cell potential using a voltmeter with the calculated potential using the Nernst equation or other relevant formulas.