You want to prepare a solution with a concentration of 200.0μm from a stock solution with a concentration of 500.0mm. at your disposal, you have 5-ml and 10-ml transfer pipets and volumetric flasks of sizes 100, 250, 500, and 1000ml. which of the following serial dilutions will give you the 200.0μm solution?

1) The dilution scheme will result in a 200μM solution.

2) The dilution scheme will not result in a 200μM solution.

3) The dilution scheme will not result in a 200μM solution.

4) The dilution scheme will result in a 200μM solution.

5) The dilution scheme will result in a 200μM solution.

Explanation:

Convert the given original molarity to molar as follows.

Consider the following serial dilutions.

1)

Dilute 5.00 mL of the stock solution upto 500 mL . Then dilute 10.00 mL of the resulting solution upto 250.0 mL.

Molarity of 500 mL solution:

10 mL of this solution is diluted to 250 ml

Convert μM :

Therefore, The dilution scheme will result in a 200μM solution.

2)

Dilute 5.00 mL of the stock solution upto 100 mL . Then dilute 10.00 mL of the resulting solution upto 1000 mL.

Molarity of 100 mL solution:

10 mL of this solution is diluted to 1000 ml

Convert μM :

Therefore, The dilution scheme will not result in a 200μM solution.

3)

Dilute 10.00 mL of the stock solution upto 100 mL . Then dilute 5 mL of the resulting solution upto 100 mL.

Molarity of 100 mL solution:

5 mL of this solution is diluted to 1000 ml

Convert μM :

Therefore, The dilution scheme will not result in a 200μM solution.

4)

Dilute 5 mL of the stock solution upto 250 mL . Then dilute 10 mL of the resulting solution upto 500 mL.

Molarity of 250 mL solution:

10 mL of this solution is diluted to 500 ml

Convert μM :

Therefore, The dilution scheme will result in a 200μM solution.

5)

Dilute 10  mL of the stock solution upto 250 mL . Then dilute 10 mL of the resulting solution upto 1000 mL.

Molarity of 250 mL solution:

10 mL of this solution is diluted to 1000 ml

Convert μM :

Therefore, The dilution scheme will result in a 200μM solution.