Using a 5 ml Pasteur pipette correctly ensures both safety and precision in the lab. Start by squeezing the bulb at the top to expel air, then immerse the tip in the liquid and release the bulb slowly to draw the desired volume. Avoid overfilling, as liquid can enter the bulb and contaminate subsequent samples. When dispensing, hold the pipette vertically and squeeze the bulb gently to release liquid in controlled drops. For accurate volume estimation, read the meniscus at eye level using the calibrated scale on the pipette.
Safety precautions are critical when using a 5 ml Pasteur pipette. Never mouth pipette any liquid, even water, as this can lead to accidental ingestion of hazardous materials. Dispose of used pipettes in appropriate biohazard or chemical waste containers to prevent cross-contamination. When working with volatile or corrosive liquids, wear gloves and eye protection to avoid splashes. Regularly inspect pipettes for cracks or damage before use, as faulty pipettes can leak and cause spills. By following these steps, users can maximize the effectiveness of the 5 ml Pasteur pipette while minimizing risks in the lab.