CARA MENENTUKAN KADAR ASAM ASETAT DALAM CUKA MAKAN - TITRASI ASAM BASA KELAS XI

Summary

In this educational video, the host demonstrates how to determine the concentration of acetic acid in vinegar using an acid-base titration experiment. The process involves measuring the volume of NaOH solution required to neutralize a known volume of vinegar, with the endpoint indicated by a color change using phenolphthalein. The calculations lead to the determination of the acetic acid concentration both in molar terms and as a percentage. The video emphasizes accuracy in the experiment and the importance of using standardized NaOH solutions. The conclusion encourages balance and moderation, relating the scientific process to broader life lessons.

Takeaways

• 😀 The video demonstrates how to determine the concentration of acetic acid in vinegar using an acid-base titration.
• 😀 The experiment uses phenolphthalein as an indicator and NaOH (0.1 M) as the titrant.
• 😀 To begin, 10 ml of vinegar is measured and added to an Erlenmeyer flask along with phenolphthalein.
• 😀 The NaOH solution is added drop by drop until a color change from yellow to pink occurs, indicating the endpoint.
• 😀 Three trials are conducted, with NaOH volumes of 21.1 ml, 21.2 ml, and 21.2 ml respectively.
• 😀 The average volume of NaOH used across all trials is calculated as 21.1 ml.
• 😀 The moles of NaOH used are calculated by multiplying the molarity (0.1 M) with the volume of NaOH used in each trial.
• 😀 The molar concentration of acetic acid (CH3COOH) in the vinegar is determined to be approximately 4.23 mol/L.
• 😀 The percentage of acetic acid in the vinegar is calculated to be 25.4%.
• 😀 The results may vary slightly due to potential inaccuracies in the NaOH concentration or reading the volume during the titration.
• 😀 The video emphasizes the importance of standardizing NaOH solution and being precise in measurements to achieve accurate results.

Q & A

What is the purpose of the titration experiment in the video?

The purpose of the titration experiment is to determine the concentration of acetic acid (CH₃COOH) in vinegar by reacting it with a known concentration of NaOH (sodium hydroxide).

What are the steps involved in the titration process outlined in the video?

The steps include measuring 10 mL of vinegar, adding phenolphthalein indicator, titrating with NaOH from a burette, and observing the color change from yellow to pink to determine the endpoint.

How is the volume of NaOH used to reach the endpoint determined?

The volume of NaOH is measured using a burette. The titration is stopped when the color of the solution changes from yellow to pink, which indicates the neutralization of acetic acid by NaOH.

What is the significance of the phenolphthalein indicator in this experiment?

Phenolphthalein is used as an indicator because it changes color at the endpoint of the titration, helping to identify when the reaction between acetic acid and NaOH is complete.

How is the molarity of acetic acid calculated based on the titration results?

The molarity of acetic acid is calculated by using the volume of NaOH required to neutralize the acetic acid. Since the mole ratio between NaOH and CH₃COOH is 1:1, the moles of NaOH are equal to the moles of acetic acid, which allows for the calculation of its molarity.

What is the average volume of NaOH used in the titration trials?

The average volume of NaOH used in the titration trials is 21.1 mL, based on three trials with volumes of 21.1 mL, 21.2 mL, and 21.2 mL.

What is the molarity of acetic acid found in the vinegar from the experiment?

The molarity of acetic acid found in the vinegar is 4.234 M, calculated from the volume of NaOH used in the titration.

How is the percentage concentration of acetic acid in the vinegar calculated?

The percentage concentration is calculated by first determining the mass of acetic acid in the vinegar using its molarity and molar mass, then dividing that mass by the total mass of the solution and multiplying by 100 to obtain the percentage.

What was the percentage of acetic acid found in the vinegar?

The percentage of acetic acid found in the vinegar is 25.4%, based on the calculations from the titration experiment.

What factors could affect the accuracy of the titration results?

Factors such as the concentration of NaOH not being standardized, inaccuracies in measuring volumes, and improper reading of the burette could all affect the accuracy of the titration results.