Question

Given the following glassware, choose the best glassware(s) to achieve the optimal combination of precision and speed for the specified procedures. You may use the same glassware more than once.

A. 10 mL Mohr pipet or pipettor
B. 100 mL volumetric flask
C. 5 mL volumetric pipet
D. 25 mL buret
E. 25 mL graduated cylinder
F. 125 mL Erlenmeyer flask
G. 10 mL volumetric pipet

Procedure 1: Make a 100.00 mL dilute NaOH solution.
Procedure 2: Transfer 10.00 mL from one container to another.
Procedure 3: Transfer 8.15 mL from one container to another.
Procedure 4: Transfer 11.7 mL from one container to another.

Answer 1

For laboratory preparation and transfer of solutions, a 100 mL volumetric flask is optimal for making a precise 100.00 mL solution, a 10 mL volumetric pipet for transferring exactly 10.00 mL, and a 25 mL buret for accurately measuring and transferring volumes like 8.15 mL and 11.7 mL. The correct answer is option D, G, B.

Step-by-step explanation:

Choosing the most appropriate glassware for transferring and measuring liquids in a laboratory setting is crucial for achieving precision and speed. The volumetric flask, buret, and pipette are common laboratory glasswares used for such purposes.

For Procedure 1: Making a 100.00 mL dilute NaOH solution, the best glassware to use is a 100 mL volumetric flask (Option B) as it is designed for preparing precise volumes of solutions.

For Procedure 2: Transferring 10.00 mL from one container to another, a 10 mL volumetric pipet (Option G) would afford the necessary precision.

For Procedure 3: Transferring 8.15 mL from one container to another, a 25 mL buret (Option D) with graduations that allow for measurements to the nearest 0.01 mL would be best as it can deliver this specific volume accurately.

For Procedure 4: Transferring 11.7 mL from one container to another, the 25 mL buret (Option D) again would be suitable because it can accurately measure variable volumes.