How do you avoid contamination in solution preparation?

To avoid contamination in solution preparation, use clean equipment, measure accurately, and follow proper lab procedures.

In more detail, the first step to avoid contamination is to ensure that all the equipment you use is clean. This includes beakers, pipettes, measuring cylinders, and any other tools you might need. Before you start, wash them thoroughly with distilled water. This will remove any residual chemicals or substances that could contaminate your solution.

Next, measure your ingredients accurately. Use the correct measuring tools for each ingredient and make sure you read the measurements correctly. For example, when measuring a liquid, look at the bottom of the meniscus (the curve formed by the liquid in the measuring tool) at eye level. This will give you the most accurate measurement.

When adding your ingredients to the solution, do so slowly and carefully. If you rush, you could spill some of the ingredients, which could lead to inaccurate results. Also, make sure you add the ingredients in the correct order. Some chemicals react differently depending on the order in which they are mixed, so it's important to follow the instructions exactly.

Finally, follow proper lab procedures. This includes wearing the appropriate safety gear, such as gloves and goggles, to protect yourself and prevent contamination from your skin or clothing. Also, make sure you dispose of any waste properly. Don't pour leftover chemicals down the sink, as they could contaminate the water supply. Instead, dispose of them in the designated waste containers.

By following these steps, you can minimise the risk of contamination and ensure that your solution preparation is as accurate and safe as possible.