How to Prepare 72 Percent Sulphuric Acid
Sulphuric acid, also known as sulfuric acid, is a highly corrosive and dangerous chemical that is widely used in various industries, including pharmaceuticals, agriculture, and manufacturing. One common concentration of sulphuric acid is 72 percent, which is often used for specific applications that require a high concentration of the acid. In this article, we will discuss the steps involved in preparing 72 percent sulphuric acid, ensuring safety and accuracy throughout the process.
Materials and Equipment Needed
Before beginning the preparation of 72 percent sulphuric acid, it is essential to gather all the necessary materials and equipment. Here is a list of items you will need:
1. Pure concentrated sulphuric acid (98-99 percent)
2. Distilled water
3. A clean and dry container with a tight-fitting lid
4. Safety equipment, including gloves, goggles, and a lab coat
5. A graduated cylinder or a measuring cup
6. A stirrer or a magnetic stirrer
7. A pH meter or pH test strips
8. A fume hood or a well-ventilated area
Step-by-Step Guide to Prepare 72 Percent Sulphuric Acid
1. Safety Precautions: Before starting the preparation process, make sure to wear the appropriate safety equipment, including gloves, goggles, and a lab coat. Ensure that you are working in a well-ventilated area or a fume hood to avoid inhaling harmful gases.
2. Measure the Concentrated Sulphuric Acid: Using a graduated cylinder or a measuring cup, carefully measure the required amount of pure concentrated sulphuric acid (98-99 percent). The exact amount will depend on the desired concentration of the final solution.
3. Add Distilled Water: Slowly add distilled water to the container, making sure to pour it into the acid rather than the other way around. This step is crucial to prevent a violent reaction that could cause splashing or release harmful gases.
4. Stir the Mixture: Once the water has been added, use a stirrer or a magnetic stirrer to mix the solution thoroughly. This will ensure that the acid and water are evenly distributed throughout the container.
5. Monitor the pH: Use a pH meter or pH test strips to monitor the pH of the solution. The pH should be around 1.5 to 2.5 for a 72 percent sulphuric acid solution. If the pH is too low, add more water and stir well. If the pH is too high, add a small amount of concentrated sulphuric acid and stir again.
6. Final Adjustments: Once the desired pH is achieved, the solution is ready for use. Make sure to label the container with the concentration and date of preparation.
7. Dispose of Waste Properly: Dispose of any waste materials, including the empty container and any unused concentrated sulphuric acid, in accordance with local regulations and guidelines.
By following these steps, you can safely and accurately prepare a 72 percent sulphuric acid solution. Always prioritize safety and take necessary precautions to avoid accidents and harm.
