Praktikum Kimia Instrumen 2 - Percobaan 7: Elektrogravimetri

Summary

In this video, the process of electrogravimetric measurement using copper in an acidic solution is demonstrated. The experiment begins with conditioning copper in an acidic environment, typically using nitric or sulfuric acid. The setup involves connecting electrodes to the power source, followed by submerging them into a CuSO4 solution. Electrolysis occurs while monitoring the process. Afterward, the copper cathode is cleaned with alcohol and acetone, heated for 5 minutes, cooled, and weighed to determine the result. The video walks through each step of this precise electrogravimetric method.

Takeaways

• 😀 The experiment focuses on electrogravimetry using copper in an acidic environment, typically with nitric or sulfuric acid.
• 😀 Copper is conditioned in the solution for the experiment, where initial measurements are taken, starting with a weight of 5.2872 grams.
• 😀 The setup involves using electrodes connected to red (cathode) and black (anode) cables.
• 😀 Electrodes are immersed into a CuSO4 solution, prepared according to the specific procedure for electrolysis.
• 😀 The electrolysis process is allowed to run, and the experimenter periodically checks and rinses the electrodes with water.
• 😀 After completing the electrolysis, the apparatus is powered off, and the cathode is removed from the solution.
• 😀 The cathode is washed with alcohol and acetone to remove impurities and contaminants.
• 😀 The cathode is then heated for 5 minutes and allowed to cool down.
• 😀 Once the cathode is cool, its weight is measured again to track the results of the electrogravimetric process.
• 😀 The overall experiment aims to measure changes in weight due to the electrochemical reaction and to assess the copper deposition during electrolysis.

Q & A

What is the purpose of the experiment described in the transcript?

The purpose of the experiment is to conduct electrogravimetry, specifically measuring the deposition of copper using electrolysis in an acidic solution, typically with nitric or sulfuric acid.

What kind of acid is commonly used in this electrogravimetric process?

The acids commonly used are nitric acid or sulfuric acid, which help in conditioning the copper in an acidic environment.

How are the electrodes set up for the experiment?

The electrodes are set up by connecting the positive electrode (cathode) to the red cable and the negative electrode (anode) to the black cable.

What solution is used for the electrolysis process in this experiment?

A copper sulfate (CuSO₄) solution is used for the electrolysis process.

What happens during the electrolysis process?

During the electrolysis process, copper ions from the CuSO₄ solution are deposited onto the cathode, which is the electrode connected to the negative terminal.

How is the electrode cleaned after the electrolysis process?

After the electrolysis process, the electrode is rinsed with water, and then cleaned using alcohol and acetone.

What is the purpose of heating the electrode after cleaning?

The electrode is heated for 5 minutes to remove any residual moisture, which ensures an accurate weight measurement after it is cooled.

How long is the cathode heated during the experiment?

The cathode is heated for 5 minutes.

Why is it important to weigh the cathode after it has cooled down?

It is important to weigh the cathode after it has cooled down to determine the mass of copper deposited during the electrolysis process, which is the key measurement in this experiment.

What is the initial weight of the cathode as mentioned in the transcript?

The initial weight of the cathode is given as 5.2872 grams.