American Chemical Society (ACS) Laboratory Safety Test 2025 – 400 Free Practice Questions to Pass the Exam

The most appropriate technique for pipetting liquids is to use a pipette aid. This method is essential to prevent the inhalation of hazardous materials, which can pose significant health risks. Using a pipette aid enhances safety and ensures that the process is not only more efficient but also reduces the risk of contamination from mouth pipetting, which is an outdated and dangerous practice.

Utilizing a pipette aid allows for precise control over the volume being transferred and minimizes the likelihood of accidents that can occur when liquids are pipetted by mouth. Additionally, pipette aids often provide a better ergonomic grip and control over the liquid being handled, further enhancing safety in the laboratory environment.

In contrast to using a pipette aid, mouth pipetting is highly discouraged because it can easily result in the ingestion of toxic or hazardous substances. Pipetting directly from the container compromises accuracy and increases the risk of spills or contamination of the original solution. Lastly, using a funnel and vacuum suction is typically reserved for larger volumes and situations that require more specialized equipment, making it less suitable for routine pipetting tasks in precise laboratory work.