You are a work study student in our chemistry department. Amy, your supervisor has just asked you to prepare 100ml of 2.00M NaOH solution for tomorrow's undergraduate experiment. The Stock Solutions cabinet is under the Stockroom Explorer. You will find find a 2.50 liter bottle containing 19M NaOH. Please prepare a flask containing 100ml of a 2.00M solution.
To prepare 100ml of a 2.00M NaOH solution, you will need to dilute the 19M NaOH stock solution using the formula:
C1V1 = C2V2
Where:
C1 = Concentration of stock solution
V1 = Volume of stock solution to be used
C2 = Desired concentration of final solution
V2 = Desired volume of final solution
In this case, C1 = 19M, V1 is the volume of stock solution to be used (unknown), C2 = 2.00M, and V2 = 100ml.
Let's calculate V1, the volume of stock solution to be used:
C1V1 = C2V2
(19M)(V1) = (2.00M)(100ml)
Rearranging the equation to solve for V1:
V1 = (C2V2) / C1
V1 = (2.00M)(100ml) / (19M)
V1 = (200 ml * M) / (19)
Now, we can calculate the volume of the stock solution needed:
V1 = (200 ml * M) / (19)
V1 ≈ 10.53 ml
Therefore, you should measure approximately 10.53 ml of the 19M NaOH stock solution using a graduated cylinder or pipette.
After measuring the stock solution, transfer it into a 100ml volumetric flask. Then, add water to reach the 100ml mark on the flask, ensuring thorough mixing to obtain a 2.00M NaOH solution.
Note: When making chemical solutions, it is crucial to exercise caution and follow proper safety protocols.