PRAKTIKUM TITRASI ASAM BASA : PENETAPAN KADAR ASAM SALISILAT || KIMIA ANALITIK || KIMIA SMA KELAS XI

Summary

In this video, the process of acid-base titration to analyze salicylic acid content is demonstrated. The procedure starts with the standardization of sodium hydroxide (NaOH) using oxalic acid, followed by the titration of a salicylic acid sample. Key steps include pipetting, preparation of the buret, and careful observation of the color change in the Erlenmeyer flask to determine the endpoint. The concentration of NaOH is calculated, and the salicylic acid content is determined by titration. The video offers a clear, step-by-step guide for performing this titrimetric analysis with precision and accuracy.

Takeaways

• 😀 The video demonstrates an acid-base titration procedure for analyzing salicylic acid content in a sample.
• 😀 The first step involves preparing a NaOH solution and ensuring it's at the correct concentration.
• 😀 The burette must be thoroughly rinsed with the NaOH solution to avoid contamination before filling it.
• 😀 It's important to ensure there are no air bubbles in the burette and that it's filled above the zero mark.
• 😀 The pipette used for transferring the sample should also be rinsed with the solution to avoid cross-contamination.
• 😀 The titration begins by adding NaOH from the burette into the salicylic acid solution in the Erlenmeyer flask.
• 😀 A white surface should be placed under the flask to help observe the color change during titration.
• 😀 The titration proceeds until a light pink color appears, indicating the endpoint has been reached.
• 😀 The final volume of NaOH used during titration must be recorded accurately for calculations.
• 😀 The concentration of the NaOH solution is first standardized using oxalic acid before titrating the salicylic acid sample.
• 😀 The final result, based on the titration, indicates the salicylic acid concentration in the sample (98.40%).

Q & A

What is the purpose of the acid-base titration demonstrated in the video?

The purpose of the acid-base titration demonstrated in the video is to determine the concentration of salicylic acid in a sample.

What is the first step in the titration process outlined in the video?

The first step in the titration process is the preparation of a standard sodium hydroxide (NaOH) solution, followed by filling and rinsing the burette with the NaOH solution.

Why is it important to rinse the burette before using it in titration?

Rinsing the burette is important to remove any previous contaminants or chemicals that might affect the accuracy of the titration, ensuring only the NaOH solution is present.

How do you ensure that the burette is filled correctly for the titration?

To ensure correct filling of the burette, you must fill it with NaOH solution, making sure that the tip of the burette is free of air bubbles and that the volume level is slightly above the 0 mL mark before beginning the titration.

What is the purpose of the indicator in the titration process?

The indicator is used to signal the endpoint of the titration by changing color, in this case, turning pink when the titration is complete.

How do you identify the endpoint of the titration in this experiment?

The endpoint is identified when the solution in the Erlenmeyer flask turns a faint pink color that persists even after shaking, indicating that the titration is complete.

What is the purpose of standardizing the NaOH solution using oxalic acid?

The purpose of standardizing the NaOH solution using oxalic acid is to accurately determine the concentration of NaOH, which is necessary for precise calculations during the titration of the salicylic acid sample.

What should be done after titrating with oxalic acid to calculate the concentration of NaOH?

After titrating with oxalic acid, you should record the volume of NaOH used, then use this data to calculate the concentration of NaOH by applying it to the titration formula.

How is the salicylic acid sample prepared for titration?

The salicylic acid sample is first dissolved in an alcohol solvent. The alcohol volume must be accurately measured to ensure that the solution is properly prepared for titration.

What was the final concentration of NaOH after the standardization process?

The final concentration of NaOH after the standardization process was found to be 0.1009 N.

What was the final result of the titration of salicylic acid in terms of its concentration?

The final result of the titration of salicylic acid showed that the concentration of salicylic acid in the sample was 98.40%.

Why is it essential to keep the burette and Erlenmeyer flask clean during the titration?

It is essential to keep both the burette and Erlenmeyer flask clean to avoid contamination, which could lead to inaccurate titration results and affect the final calculations.