How to Prepare 0.1 M HCl Solution in 100ml
Preparing a 0.1 M (molar) hydrochloric acid (HCl) solution in 100ml is a common task in chemistry laboratories. This solution is widely used in various experiments and applications, such as titrations, cleaning, and as a reagent. In this article, we will guide you through the steps to prepare a 0.1 M HCl solution in 100ml with precision and safety.
Materials Needed:
Before starting the preparation, ensure you have the following materials on hand:
1. Pure hydrochloric acid (HCl) – 0.1 M concentration
2. Distilled water
3. A 100ml volumetric flask
4. A graduated cylinder or a pipette
5. Safety goggles
6. Gloves
7. A laboratory apron
8. A beaker
Step-by-Step Instructions:
1. Safety Precautions: Always wear safety goggles, gloves, and a laboratory apron when handling concentrated acids. Ensure you are working in a well-ventilated area.
2. Measure the HCl: Using a graduated cylinder or a pipette, measure 0.3665 grams of pure HCl. The molar mass of HCl is approximately 36.46 g/mol. Therefore, 0.3665 grams is equivalent to 0.01 moles of HCl.
3. Add HCl to the Flask: Carefully pour the measured HCl into the 100ml volumetric flask. Be cautious, as HCl is a corrosive substance and can cause harm if it comes into contact with skin or eyes.
4. Add Distilled Water: Add distilled water to the flask until the solution reaches the 50ml mark. Swirl the flask gently to ensure the HCl is dissolved.
5. Fill to the Mark: Continue adding distilled water to the flask, swirling gently after each addition, until the solution reaches the 100ml mark on the flask. This ensures the final volume is accurate.
6. Final Adjustments: Once the solution reaches the 100ml mark, check the accuracy of the volume by adding a few drops of water and adjusting if necessary. Ensure the meniscus is at the 100ml mark.
7. Stir the Solution: Gently swirl the flask for a few minutes to ensure the solution is well-mixed.
8. Label the Flask: Label the flask with the concentration (0.1 M), the substance (HCl), and the date of preparation.
9. Dispose of Waste: Dispose of the remaining HCl and any contaminated materials according to your institution’s guidelines.
By following these steps, you can successfully prepare a 0.1 M HCl solution in 100ml. Always prioritize safety and accuracy when working with chemicals in a laboratory setting.
