Question

Which statement represents an unsafe procedure for heating a nutrient solution in a flask?

A)
heat the solution at the lowest temperature possible on a hot plate
B)
stopper the flask tightly to prevent evaporation of the solution
C)
use a Bunsen burner to heat the solution
D)
stir the solution while it is heating

Answer 1

The unsafe procedure for heating a nutrient solution in a flask is C) use a Bunsen burner to heat the solution.

Step-by-step explanation:

Using a Bunsen burner can lead to localized heating and uneven distribution of heat in the flask, risking the solution to rapidly reach high temperatures or even boil unexpectedly, potentially causing spattering or thermal shock to the glassware. This method lacks precise temperature control compared to a hot plate and may increase the chances of accidents or flask breakage due to direct flame exposure. It's safer to heat solutions gradually with a hot plate, allowing for better control and uniform heating. Additionally, stopping the flask tightly (option B) could lead to pressure buildup and potential breakage, making it another unsafe practice.

Correct Answer: C) use a Bunsen burner to heat the solution.