PRAKTIKUM ELEKTROKIMIA | Sel ELektrolisis dan Sel Volta

Catatan Bu Julia

2 May 202105:12

Summary

TLDRThis 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.

Outlines

00:00

🔬 Basic Electrochemistry Lab Experiment

This paragraph introduces a basic chemistry lab session focused on electrochemistry, specifically electroplating and voltaic cell experiments. The objective is to determine the reactions occurring at the anode and cathode, observe electrolysis events, measure cell potential, and compare the results with calculated values. The lab procedure involves inserting potassium iodide solution into a test tube, adding electrodes, connecting them to a power source for 5 minutes, and observing changes at the electrodes. Indicators are added to the cathode chamber to observe color changes. The second part of the procedure involves setting up a voltaic cell with CuSO4 and ZnSO4 solutions, creating a salt bridge with filter paper, and using metals corresponding to the solutions. The potential of the cell is measured and compared with calculated values using a multimeter and a voltmeter.

05:03

📢 Closing Remarks and Greetings

The second paragraph serves as the closing of the video script, offering greetings and closing remarks. It acknowledges the viewers' attention and expresses a wish for their next meeting, ending the session on a polite and respectful note.

Mindmap

Keywords

💡Electrolysis

Electrolysis is a chemical process that uses an electric current to drive a non-spontaneous chemical reaction. In the context of the video, electrolysis is the main theme, as it discusses the reactions occurring at the anode and cathode within an electrolytic cell. The script describes observing changes at the electrodes during the electrolysis of potassium iodide solution.

💡Anode

The anode is the electrode through which conventional current flows into the electrolyte during electrolysis. It is the site of oxidation reactions. In the video script, the anode is where bubbles may form or color changes occur, indicating the oxidation process taking place.

💡Cathode

The cathode is the electrode where conventional current flows out of the electrolyte during electrolysis, and it is the site of reduction reactions. The script mentions observing changes at the cathode, which is crucial for understanding the electrolysis process.

💡Electrolytic Cell

An electrolytic cell is a type of electrochemical cell that uses an external voltage to drive a non-spontaneous redox reaction. The video script describes setting up an electrolytic cell with potassium iodide solution and observing the reactions at the electrodes.

💡Indicator

In chemistry, an indicator is a substance that changes color in response to changes in pH or other chemical conditions. The script mentions adding indicators (pp and amilum) to observe color changes, which helps in identifying the chemical reactions occurring in the electrolytic cell.

💡Potassium Iodide

Potassium iodide is a chemical compound with the formula KI, consisting of iodide ions and potassium ions. In the script, potassium iodide solution is used in the electrolytic cell to demonstrate the electrolysis process.

💡Copper Sulfate (CuSO4)

Copper sulfate is a chemical compound used in various applications, including as an electrolyte in electrochemistry. The script refers to adding copper sulfate solution to a beaker for a voltaic cell experiment, which is part of the video's exploration of electrochemistry.

💡Zinc Sulfate (ZnSO4)

Zinc sulfate is another chemical compound used in the context of the video as an electrolyte solution in a voltaic cell. It is combined with copper sulfate to demonstrate the principles of a voltaic cell.

💡Salt Bridge

A salt bridge is a device that allows ions to flow between the two half-cells of a voltaic cell or an electrolytic cell to maintain electrical neutrality. The script describes creating a salt bridge using filter paper to complete the circuit in the voltaic cell experiment.

💡Multimeter

A multimeter is an electronic measuring instrument that combines several measurement functions in one unit, such as voltage, current, and resistance. In the script, a multimeter is used to measure the potential difference in the voltaic cell, which is a key aspect of the experiment.

💡Potential

In electrochemistry, potential refers to the driving force for an electrochemical reaction, often measured in volts. The script discusses calculating and comparing the potential of the cell, which is essential for understanding the energy changes during electrolysis and the operation of a voltaic cell.

Highlights

Introduction to Basic Chemistry Lab 2 on Electrolysis and Voltaic Cells.

Objective to determine reactions at the anode and cathode, and observe electrolysis events.

Measurement of cell potential and comparison with calculated values.

Overview of tools and materials used in the lab.

Procedure begins with the electrolysis cell setup.

Insertion of potassium iodide solution into the test tube.

Placement of electrodes into the solution and connection to a power source for 5 minutes.

Observation of changes at the anode and cathode, such as bubble formation or color changes.

Addition of phenolphthalein indicator to the cathode and observation of color changes.

Addition of amylum indicator to the anode and color change observation.

Introduction to the Voltaic cell experiment with copper sulfate and zinc sulfate solutions.

Creation of a salt bridge using filter paper soaked in solutions.

Insertion of appropriate metals into the solutions and observation of multimeter readings.

Comparison of calculated cell potential with the readings from the voltmeter.

Conclusion of the lab session with a reminder for future meetings.

Closing with a traditional greeting in the context of the video's cultural setting.