What is the role of a pipette in ensuring accuracy in titrations?

A pipette ensures accuracy in titrations by delivering precise volumes of liquid to the solution.

In a titration, the goal is to determine the concentration of an unknown solution by reacting it with a solution of known concentration. This process requires the accurate measurement of the volume of both solutions, which is where the pipette comes in. A pipette is a laboratory tool commonly used to transport a measured volume of liquid. It is designed to deliver a very precise volume of liquid, with minimal error.

The pipette's role in ensuring accuracy in titrations is crucial. It is used to measure and deliver the exact volume of the titrant, the solution of known concentration, into the analyte, the solution of unknown concentration. The accuracy of the pipette's measurement directly affects the accuracy of the final result. If the volume of the titrant is not accurately measured, the calculated concentration of the analyte will be incorrect.

Moreover, pipettes are calibrated to a specific temperature, usually 20°C. This is because the volume of a liquid can change with temperature. If the temperature during the titration is different from the calibration temperature, the volume delivered by the pipette may not be accurate. Therefore, it is important to use the pipette correctly and at the correct temperature to ensure the accuracy of the titration.

In addition, pipettes are designed to minimise the risk of contamination. They are made of glass or plastic and are easy to clean and sterilise. This ensures that the solutions used in the titration are not contaminated, which could otherwise affect the accuracy of the results.

In conclusion, the pipette plays a vital role in ensuring accuracy in titrations. It allows for the precise measurement and delivery of the titrant, which directly affects the accuracy of the final result.