Pembuatan Larutan Standar Titrasi Asidimetri

Summary

This video demonstrates the process of creating a 0.1 N hydrochloric acid (HCl) solution for acidimetric titration. The procedure begins with the preparation of the HCl solution by carefully measuring and diluting concentrated HCl with distilled water. Next, the standardization of the HCl solution is performed using sodium carbonate and methyl orange as an indicator. The titration is conducted by adding the HCl solution from a burette into a sodium carbonate solution until a color change is observed, signaling the endpoint. The video provides a step-by-step guide to ensure accurate and safe laboratory practice.

Takeaways

• 😀 The script is a step-by-step guide for preparing a standard solution for acidimetric titration.
• 😀 The procedure begins by preparing a 0.1 N HCl solution from concentrated HCl.
• 😀 Proper safety precautions include working with concentrated HCl inside a fume hood to avoid contamination.
• 😀 The exact amount of HCl needed (0.83 mL) is pipetted and added to a volumetric flask containing distilled water.
• 😀 The volumetric flask is filled with distilled water to the 100 mL mark, and the solution is mixed thoroughly.
• 😀 Standardization of the HCl solution is performed using sodium carbonate (Na₂CO₃) as the standard substance.
• 😀 Sodium carbonate is weighed precisely (106 mg) before it is placed in an Erlenmeyer flask.
• 😀 The sodium carbonate is dissolved with distilled water and swirled for even distribution.
• 😀 The titration involves adding the prepared HCl solution from a buret into the sodium carbonate solution until the endpoint is reached.
• 😀 Methyl orange is used as an indicator, with the color change from yellow to orange signaling the endpoint of the titration.
• 😀 The script emphasizes the simplicity and clarity of the experimental procedure while promoting safety and accuracy in the lab.

Q & A

What is the main objective of the procedure described in the transcript?

The main objective is to prepare and standardize a 0.1 N hydrochloric acid (HCl) solution through a titration process.

Why is concentrated hydrochloric acid (HCl) handled in a fume hood?

Concentrated HCl is handled in a fume hood to avoid exposure to its fumes, which can be hazardous to health.

What is the role of the methyl orange indicator in this procedure?

Methyl orange is used as an indicator in the titration process to signal the endpoint when the solution changes color, indicating that the acid has neutralized the sodium carbonate.

How is the 0.1 N HCl solution prepared?

The 0.1 N HCl solution is prepared by diluting concentrated HCl with aquades (distilled water) to the desired concentration in a 100 mL volumetric flask.

What is the importance of ensuring accurate measurement when filling the buret with HCl?

Accurate measurement is crucial because the titration results depend on the precise volume of HCl used, which directly affects the calculation of the concentration of sodium carbonate.

Why is sodium carbonate (Na2CO3) used in this procedure?

Sodium carbonate is used as the primary standard to determine the concentration of the HCl solution by reacting with it in the titration process.

What is the procedure for transferring sodium carbonate to the Erlenmeyer flask?

Sodium carbonate is weighed (106 mg) and transferred into an Erlenmeyer flask. The flask is then rinsed with 25 mL of aquades to dissolve the sodium carbonate.

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

The buret is used to precisely dispense the 0.1 N HCl solution into the Erlenmeyer flask containing sodium carbonate during the titration to determine the endpoint.

At what point do you stop the titration?

The titration is stopped when the solution in the Erlenmeyer flask changes color to light orange, indicating that the neutralization reaction is complete.

What are the safety precautions taken during the procedure?

The use of a fume hood when handling concentrated HCl and the proper handling of chemicals such as sodium carbonate and methyl orange ensures safety during the procedure.