Praktikum Titrasi Asam Basa ( Asam Cuka Perdagangan)

Summary

In this video, the presenter takes viewers through a chemistry laboratory practical on acid-base titration. The goal is to determine the acetic acid concentration using volumetric titration. The process includes diluting acetic acid, using pipettes and burets for accurate measurements, and applying phenolphthalein as an indicator. The titration is conducted with NaOH, and the endpoint is reached when the solution turns a faint pink. The video demonstrates how to calculate the concentration of acetic acid, revealing its molarity and concentration in percentage. A practical guide to basic lab skills and titration calculations is provided throughout the demonstration.

Takeaways

• 😀 The video introduces a chemistry lab experiment on acid-base titration, specifically aimed at determining the concentration of vinegar using volumetric titration.
• 😀 Titration is a procedure used to determine the amount of a solution with a known concentration that reacts with a solution whose concentration is to be determined.
• 😀 Essential materials for titration include a burette, pipette, Erlenmeyer flask, funnel, phenolphthalein indicator, and NaOH solution.
• 😀 The process begins by diluting vinegar (acetic acid) by measuring 10 ml of it with a pipette and transferring it into a volumetric flask.
• 😀 A pipette filler is used to draw and release liquid from the pipette. It's crucial to understand the three parts of the filler: air, suction, and ejection.
• 😀 When using the pipette, ensure that the meniscus is at eye level with the measurement scale for accuracy.
• 😀 The diluted vinegar is further mixed with distilled water to achieve the desired volume in the volumetric flask.
• 😀 A burette is used to titrate the diluted vinegar. The tap at the bottom of the burette controls the flow of the NaOH solution.
• 😀 The titration process continues by adding NaOH solution drop by drop until the vinegar turns a faint pink, indicating the end point.
• 😀 After completing the titration, the volume of NaOH used is recorded, and the molarity of the vinegar is calculated using the titration data.
• 😀 The video concludes with the calculation of the molarity of vinegar before and after dilution and the determination of its concentration in percentage, which is approximately 24.5%.

Q & A

What is the objective of the titration experiment in this video?

The objective of the experiment is to determine the concentration of acetic acid in vinegar using volumetric titration.

What equipment is needed for the titration experiment?

The equipment needed includes a stand with clamp, burette, funnel, 100 ml beaker, 100 ml Erlenmeyer flask, 100 ml volumetric flask, 10 ml pipette, pipette filler, dropper, 1% phenolphthalein indicator, 1 molar NaOH solution, vinegar, spray bottle, and distilled water.

How do you use the pipette filler during the titration?

The pipette filler is used to draw liquid into the pipette. The process involves pressing the 'A' button to expel air, the 'S' button to suck up the solution, and the 'E' button to release the liquid into the receiving container.

What is the function of the burette in the titration process?

The burette is used to dispense a measured volume of the titrant (NaOH solution) into the analyte (vinegar) in a controlled manner. The flow rate can be adjusted by opening or closing the valve at the bottom.

How do you prepare the acetic acid solution for titration?

The acetic acid solution is first diluted by pipetting 10 ml of vinegar into a 100 ml volumetric flask and then adding distilled water until the solution reaches the calibration mark.

Why is phenolphthalein added during the titration process?

Phenolphthalein is used as an indicator to show the endpoint of the titration. It changes color from colorless to pink when the acetic acid is neutralized by the NaOH.

At what point is the titration considered complete?

The titration is considered complete when the solution in the Erlenmeyer flask turns a faint pink color, and this color persists for at least two minutes.

What is the importance of reading the burette correctly during titration?

It is crucial to read the burette accurately to determine the precise volume of NaOH used in the titration. The reading is taken at the meniscus level to ensure accuracy.

How is the molarity of acetic acid calculated in this experiment?

The molarity of acetic acid is calculated using the formula: M1V1 = M2V2, where M1 and V1 are the molarity and volume of acetic acid, and M2 and V2 are the molarity and volume of NaOH.

What is the final concentration of acetic acid in the vinegar after dilution?

The final molarity of acetic acid after dilution is 0.427 M, and the concentration of acetic acid in vinegar is calculated to be 24.54%.