Trial Volume of metal solution (mL) Volume of ligand solution (mL) Volume of sol

Question

Trial

Volume of metal solution (mL)

Volume of ligand solution (mL)

Volume of solvent (mL)

1

5

1

4

2

5

2

3

3

5

3

2

4

5

4

1

5

5

5

0

The table above presents an example of the volumes of metal solution, ligand solution, and solvent needed to conduct 5 equilibrium reactions. What piece of glassware would enable the measurement and transfer of these solutions with the best combination of speed and accuracy?

  

a) a volumetric flask

b) a beaker

c) a graduated pipette

d) an Erlenmeyer flask

e) a graduated cylinder

Trial

Volume of metal solution (mL)

Volume of ligand solution (mL)

Volume of solvent (mL)

1

5

1

4

2

5

2

3

3

5

3

2

4

5

4

1

5

5

5

0

Explanation / Answer

Graduated pipettes

pipettes are used for the transfer of solutions and solvents from one vessel to another. As with other graduated glassware, they have an approximate scale consisting of a series of equivolume units that subdivide the maximum volume of the pipette. Their accuracy is similar to that of a graduated cylinder, 0.5 to 1% of the total volume . Again, the smaller the diameter, the more accurately it can be subdivided.

Although not extremely accurate, a whole series of approximate volumes can be quickly and easily transferred. For instance, you could rapidly transfer 0.1 ml of solvent to each of 10 test tubes using a 1.0 ml pipette graduated in 0.1 ml subdivisions by merely filling to the maximum (1.0 ml) line, and then releasing 0.1 ml into each test tube.

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