Praktikum Titrasi Asam Basa | KIMIA SMA | Herlina

Summary

This video demonstrates the process of acid-base titration, aiming to determine the concentration of an unknown hydrochloric acid (HCl) solution. The procedure involves using a known concentration of sodium hydroxide (NaOH) to titrate the acid, with phenolphthalein as an indicator. The video covers the preparation of equipment and solutions, followed by multiple titration trials to ensure accuracy. The results are used to calculate the concentration of HCl, which is determined to be 0.0635 M. This experiment highlights the importance of precision and repetition in obtaining reliable results in chemical analysis.

Takeaways

• 😀 Titration is a chemical method used to determine the concentration of an unknown solution by reacting it with a solution of known concentration.
• 😀 The equipment used in the acid-base titration includes Erlenmeyer flasks, a pipette, a buret, a stand, clamps, and a chemical indicator.
• 😀 In this experiment, the acid being tested is HCl (hydrochloric acid), and the base used for titration is NaOH (sodium hydroxide).
• 😀 Before starting the titration, the buret is rinsed with distilled water, followed by rinsing with the NaOH solution to ensure accuracy.
• 😀 The buret is then filled with NaOH solution, and its initial volume is recorded to track the amount used during titration.
• 😀 10 mL of HCl is pipetted into the Erlenmeyer flasks, and phenolphthalein is added as an indicator to signal the endpoint of the titration.
• 😀 Titration is carried out by slowly adding NaOH from the buret into the Erlenmeyer flask until the solution changes color, indicating neutralization.
• 😀 The titration is repeated three times to minimize errors and obtain a reliable average result for the volume of NaOH used.
• 😀 The average volume of NaOH used in the titration (6.35 mL) is calculated from the three trials.
• 😀 The concentration of the unknown HCl solution is determined using the titration formula, which results in a concentration of 0.0635 M for the HCl solution.

Q & A

What is the purpose of the acid-base titration experiment?

The purpose of the acid-base titration experiment is to determine the concentration of an unknown acid solution by reacting it with a base solution of known concentration.

What is titration, and how is it performed?

Titration is a chemical method used to determine the concentration of a solution by reacting it with another solution of known concentration. It involves adding a titrant (the known solution) from a burette to a measured volume of the analyte (the unknown solution) until the reaction reaches its endpoint.

What tools and materials are required for the titration experiment?

The materials required include Erlenmeyer flasks, a volumetric pipette, a burette with a stand, a clamp, two beakers, and a pH indicator (phenolphthalein). The chemicals used are NaOH solution with a concentration of 0.1M and an unknown concentration of HCl solution, along with distilled water.

How is the burette prepared for the titration experiment?

The burette is first rinsed with distilled water and then with the NaOH solution. It is then filled with the NaOH solution, making sure to remove any air bubbles from the burette tip before beginning the titration.

What is the role of phenolphthalein in the titration process?

Phenolphthalein serves as an indicator during the titration. It changes color at the endpoint of the titration, signaling when the acid has been neutralized by the base.

How is the titration performed?

The titration is performed by slowly adding NaOH solution from the burette to the HCl solution in the Erlenmeyer flask, with phenolphthalein added as an indicator. The titration continues until a color change in the solution occurs, signaling the endpoint.

How do you calculate the concentration of the unknown acid solution?

The concentration of the unknown acid (HCl) can be calculated using the formula: M1 * V1 = M2 * V2, where M1 is the concentration of the unknown acid, V1 is the volume of acid used, M2 is the concentration of NaOH, and V2 is the volume of NaOH used.

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

The average volume of NaOH used in the three titration trials is 6.35 mL.

What is the balanced chemical equation for the acid-base titration reaction?

The balanced chemical equation for the acid-base titration between HCl and NaOH is: HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l).

What is the final concentration of the HCl solution determined in this experiment?

The final concentration of the HCl solution determined from the titration experiment is 0.0635 M.