Percobaan Menentukan Kadar Cuka Makan (Percobaan Titrasi Asam Basa)

Summary

This video demonstrates a titration experiment to determine the acetic acid concentration in vinegar. Using phenolphthalein as an indicator and a 0.1 M NaOH solution, the procedure involves diluting vinegar, adding the indicator, and carefully titrating with NaOH until a color change occurs. The experiment is repeated with two different vinegar brands to ensure accuracy, and the volume of NaOH used is recorded. By averaging the volume and calculating the results, the acetic acid concentration in both vinegar samples is determined, providing valuable insights into their strength.

Takeaways

• 😀 The experiment aims to determine the concentration of acetic acid in vinegar using an acid-base titration method.
• 😀 Two different brands of vinegar are tested in the experiment.
• 😀 A 0.1 M NaOH solution is used as the titrant for the experiment.
• 😀 Phenolphthalein indicator is used to signal the endpoint of the titration with a color change.
• 😀 The procedure begins by diluting 10 mL of vinegar to 100 mL with aquades (water).
• 😀 The diluted vinegar is then titrated with NaOH until the solution turns faint pink, indicating neutralization.
• 😀 The volume of NaOH used during the titration is carefully recorded.
• 😀 The experiment is repeated at least twice for each vinegar brand to ensure accuracy in the results.
• 😀 The average volume of NaOH used is calculated to determine the acetic acid concentration in the vinegar.
• 😀 The concentration of acetic acid is calculated using the known concentration of NaOH and the volume used in the titration.
• 😀 This titration method provides an accurate measurement of the acetic acid content in vinegar, allowing comparison between different brands.

Q & A

What is the purpose of the titration in this experiment?

The purpose of the titration is to determine the concentration of acetic acid in vinegar using an acid-base titration method.

Which materials and chemicals are used in the titration?

The materials used are a pipette, volumetric pipette, Erlenmeyer flask, burette, and a 100 mL volumetric flask. The chemicals include phenolphthalein as the indicator, vinegar samples from different brands, and NaOH solution with a concentration of 0.1 M.

Why is phenolphthalein used as an indicator in this titration?

Phenolphthalein is used because it changes color at the endpoint of the titration, helping to identify when the acid in the vinegar has been neutralized by the NaOH solution.

What is the procedure for preparing the vinegar samples?

First, 10 mL of vinegar from each brand is measured and placed in a 100 mL volumetric flask. It is then diluted with distilled water (aquadest) to a total volume of 100 mL and mixed thoroughly.

How is the titration process conducted?

The titration is performed by adding NaOH solution from a burette drop by drop into the Erlenmeyer flask containing the vinegar sample and phenolphthalein until the solution changes color, indicating the endpoint.

What is the volume of NaOH solution used during the titration?

The volume of NaOH solution used during the titration is recorded as it is added drop by drop. The first trial required 9.2 mL, and the second trial used 9.4 mL of NaOH.

What is the significance of repeating the experiment with different vinegar samples?

Repeating the experiment with different vinegar samples helps ensure accuracy and allows for comparison between the two brands of vinegar, providing more reliable results.

Why is it necessary to average the volumes of NaOH used in the trials?

Averaging the volumes of NaOH used helps minimize errors and provides a more accurate estimate of the NaOH required to neutralize the acetic acid in the vinegar.

What calculations are done after the titration to determine the acetic acid concentration?

After the titration, the volume of NaOH used is averaged, and the molarity of NaOH is known (0.1 M). Using the neutralization reaction between NaOH and acetic acid, the concentration of acetic acid in the vinegar is calculated.

What role does the white paper serve during the titration?

The white paper placed under the Erlenmeyer flask helps make it easier to observe the color change of the solution, improving the visibility of the endpoint of the titration.