Praktikum Analisis Kuantitatif : Nitrimetri

Summary

In this video, the host guides viewers through a practical session on quantitative analysis, specifically focusing on nitrimetric titration or diazotization. The process involves determining the concentration of sulfanilamide using a sodium nitrite solution. The host demonstrates each step, from preparing the solution and maintaining a low temperature to performing the titration process. Key procedures such as adding hydrochloric acid, cooling the mixture with ice, and observing the color change during titration are explained in detail, ending with a calculation to determine the sulfanilamide concentration in the sample.

Takeaways

• 😀 The practical session focuses on nitrimetric titration, also known as diazotization titration.
• 😀 The sample used for the titration is sulfanilamide, a compound whose concentration is being determined.
• 😀 Equipment used includes an Erlenmeyer flask, stirring rods, a thermometer, and an ice bath to maintain the temperature.
• 😀 100 mg of sulfanilamide is weighed and dissolved in water in an Erlenmeyer flask.
• 😀 Concentrated hydrochloric acid is added to the solution during the procedure.
• 😀 The titration process is performed at temperatures below 15°C, using ice to control the temperature.
• 😀 A blue color formation indicates the endpoint of the titration.
• 😀 The titration involves using sodium nitrite solution, and the volume used is noted.
• 😀 The titration is monitored using iodide paper, which changes color as the titration nears completion.
• 😀 After titration, the concentration of sulfanilamide in the sample is calculated using a specific formula.

Q & A

What is the main focus of the practical session in the script?

The main focus of the practical session is to perform a nitrimetric titration (also known as diazotation titration) to determine the concentration of sulfanilamide.

What compound is being analyzed in the experiment?

The compound being analyzed is sulfanilamide, which is determined using nitrimetric titration.

What is the first step in preparing for the experiment?

The first step is to weigh 100 mg of the sample and transfer it into an Erlenmeyer flask.

How is the sulfanilamide dissolved in the experiment?

Sulfanilamide is dissolved in water and mixed for about five minutes.

What is added to the solution after dissolving the sulfanilamide?

Concentrated hydrochloric acid is added to the solution after dissolving the sulfanilamide.

Why is it important to keep the temperature below 15°C during the titration?

The temperature must be kept below 15°C to ensure the proper conditions for the titration reaction, as specified in the procedure.

How is the temperature controlled during the experiment?

Ice cubes are used to maintain the temperature below 15°C, and the temperature is monitored using a thermometer.

What is the significance of the appearance of a blue color during titration?

The appearance of a blue color indicates that the titration is nearing completion.

What does the addition of starch-iodide paper indicate during the titration?

The addition of starch-iodide paper signals that the titration is nearing its endpoint, and the color change indicates the completion of the titration process.

How is the concentration of sulfanilamide determined at the end of the titration?

The concentration of sulfanilamide is determined by calculating the volume of sodium nitrite solution used during titration and applying the appropriate formula.