0.1 Perchloric Acid Preparation: A Step-by-Step Guide
Perchloric acid (HClO₄) is a strong oxidizing agent widely used in various analytical applications, including titrations, chromatography, and spectroscopy. In this article, we will discuss the preparation of 0.1 perchloric acid, a commonly used concentration in laboratory settings.
Materials Required
- 70% perchloric acid (HClO₄)
- Distilled water
- Glassware (flasks, beakers, and burettes)
- Pipettes (10 mL and 100 mL)
- Volumetric flask (100 mL)
Preparation of 0.1 Perchloric Acid
Step 1: Calculate the Volume of 70% Perchloric Acid Required
To prepare 100 mL of 0.1 M perchloric acid, we need to calculate the volume of 70% perchloric acid required. Since the concentration of 70% perchloric acid is 11.65 M, we can calculate the volume as follows:
Volume of 70% HClO₄ = (Molarity of 0.1 M HClO₄ x Volume of 0.1 M HClO₄) / Molarity of 70% HClO₄ = (0.1 M x 100 mL) / 11.65 M = 0.86 mL
Step 2: Measure and Add the 70% Perchloric Acid
Using a pipette, measure 0.86 mL of 70% perchloric acid and add it to a 100 mL volumetric flask.
Step 3: Add Distilled Water
Add approximately 90 mL of distilled water to the volumetric flask. Mix well to dissolve the perchloric acid.
Step 4: Dilute to the Mark
Add more distilled water to the volumetric flask until the meniscus reaches the 100 mL mark. Mix well to ensure the perchloric acid is fully dissolved.
Step 5: Verify the Preparation
Verify the preparation by checking the pH of the solution using a pH meter. The pH of 0.1 M perchloric acid should be around 1.1.
Safety Precautions
- Handle perchloric acid with care, as it is a strong oxidizing agent and can cause skin irritation and burns.
- Wear protective gloves, goggles, and lab coats when handling perchloric acid.
- Avoid inhalation of perchloric acid fumes, as they can cause respiratory problems.
- Dispose of perchloric acid waste according to local regulations and guidelines.
Conclusion
The preparation of 0.1 perchloric acid is a straightforward process that requires careful attention to detail and adherence to safety protocols. By following these steps, you can prepare high-quality 0.1 perchloric acid for your analytical applications.
