Question

why does the procedure use a graduated cylinder and not simply have you put 2 ml of solution directly into the test tube? biuret reagent will only work in a graduated cylinder. accuracy is important in the laboratory. there is no way to accurately put 2 ml into a test tube without first measuring 2 ml in the graduated cylinder. one objective of this lab is to successfully transfer liquids.

Explanation:

Graduated cylinders are designed for accurate volume - measurement. Without pre - measuring in a graduated cylinder, it's hard to accurately put 2 mL into a test tube. Biuret reagent can work in a test tube too, and liquid transfer is not the main reason for using a graduated cylinder here.

Answer:

Accuracy is important in the laboratory. There is no way to accurately put 2 mL into a test tube without first measuring 2 mL in the graduated cylinder.