Trial Volume of metal solution (mL) Volume of ligand solution (mL) Volume of sol
ID: 965117 • Letter: T
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.