Author Question: If an experiment calls for adding approximately 1 mL of a given solvent, which of these three ... (Read 82 times)

nautica902 · **on:** Aug 23, 2018

If an experiment calls for adding approximately 1 mL of a given solvent, which of these three methods would you recommend? Explain your choice. a. Measure the solvent using a graduated cylinder. b. Weigh the solvent on a balance. c. Estimate the volume using a Pasteur pipette.

Question 2

If an experiment calls for adding exactly 3.1 mL of a given solvent, which of these three methods would you recommend? Explain your choice. a. Measure the solvent using a graduated cylinder. b. Weigh the solvent on a balance. c. Estimate the volume using a Pasteur pipette.

Jmfn03 · **Reply #1 on:** Aug 23, 2018

Answer to Question 1

Because this experiment calls for an approximate volume of solvent, eyeballing with a Pasteur pipette (c) would be suitable.

Answer to Question 2

The most accurate method for measuring a liquid is to weigh it (answer b). It is necessary to know the density when the amount of liquid is given as a volume. Most graduated cylinders are graduated to 0.2 mL increments and therefore, if accuracy is important, method (a) would not be suitable. Eyeballing the volume (c) would be the least accurate method.