Kadar Karbonat Metode Titrasi Asidimetri (Tutorial Prosedur Analisis + perhitungan)

Summary

This video provides a comprehensive guide to determining the carbonate content in a sample through titration. It covers the necessary equipment, preparation of reagents, and standardization of hydrochloric acid (HCl) using sodium tetraborate. The script details the step-by-step process, including the preparation of samples, titration procedures, and the calculation of carbonate content using titrimetric methods. The video also explains the chemical reactions involved and offers precise formulas for calculating the final carbonate percentage in the sample, ensuring a clear and educational experience for viewers.

Takeaways

• 😀 Essential equipment for determining carbonate content includes Erlenmeyer flasks, volumetric pipettes, burets, indicators, and standard solutions.
• 😀 HCl is used as a titrant in this experiment, but it must first be standardized since it's not a primary standard solution.
• 😀 The process begins with standardizing HCl by titrating it against a sodium tetraborate solution, with the endpoint indicated by a color change.
• 😀 Sodium tetraborate (borax) is used as a primary standard in the HCl standardization process, requiring careful pipetting and volume measurement.
• 😀 After standardizing HCl, the next step involves preparing the sodium carbonate sample for analysis.
• 😀 Sodium carbonate is accurately weighed (about 0.1g) and dissolved in distilled water, ensuring no residue remains on the weighing bottle.
• 😀 The prepared sodium carbonate solution is transferred to a 50 mL volumetric flask, and the solution is brought to the desired volume.
• 😀 In the carbonate content determination phase, the sodium carbonate sample is titrated with the standardized HCl solution.
• 😀 The endpoint of the titration is marked by the color change from pink to colorless in the presence of phenolphthalein indicator.
• 😀 To calculate the carbonate content, the normality of the HCl solution and the volume of HCl used in titration are factored into the equation, yielding a percentage of carbonate in the sample.

Q & A

What is the first step in the experiment described in the transcript?

The first step is the standardization of HCl, as HCl is used as a titrant but it is not a primary standard solution.

Why is it important to standardize HCl before using it in the experiment?

It is important to standardize HCl because it is not a primary standard solution, and its concentration needs to be accurately determined for reliable titration results.

How is the HCl solution added to the buret in the standardization process?

HCl is poured into the buret using a funnel, ensuring that there are no air bubbles in the buret and that the solution is filled to the zero mark.

What is the purpose of the sodium tetraborate solution in the experiment?

Sodium tetraborate (borax) is used as a primary standard solution to standardize the HCl by titrating it against HCl in the standardization process.

What indicator is used during the titration of sodium tetraborate with HCl?

Methyl red indicator is used, which turns yellow because borax is basic.

What marks the endpoint of the titration in the standardization process?

The endpoint is marked by the appearance of an orange color in the solution, signaling that the titration is complete.

How is the sample of sodium carbonate prepared for the experiment?

A sample of sodium carbonate is weighed using an analytical balance, then dissolved in a beaker with water and transferred to a 50 mL volumetric flask.

What is the role of phenolphthalein in the sodium carbonate titration?

Phenolphthalein is used as an indicator, which turns from pink to colorless, signaling the endpoint of the titration.

How is the volume of HCl used for titration determined in the experiment?

The volume of HCl used is recorded at the endpoint when the color change occurs, and it is noted for calculation purposes.

How is the carbonate content of the sample calculated?

The carbonate content is calculated using a formula that involves the normality of the HCl solution, the volume of HCl used, and the molar mass of carbonate (CO₃²⁻), among other factors.