How would you prepare 500ml of 5% dextrose from a 50% stock solution?

To prepare a diluted solution from a concentrated stock solution, you can use the dilution equation, C1V1 = C2V2, where C1 is the concentration of the stock solution, V1 is the volume of the stock solution needed, C2 is the desired concentration, and V2 is the final volume of the diluted solution.

In this case, you want to prepare 500 mL of a 5% dextrose solution from a 50% stock solution. Using the dilution equation, we set it up like this:

• C1 = 50% (concentration of stock solution)

• C2 = 5% (desired concentration)

• V2 = 500 mL (final volume)

To find V1 (the volume of the stock solution needed), we rearrange the equation:

V1 = (C2 * V2) / C1

Substituting in our values:

V1 = (5% * 500 mL) / 50%

Calculating this gives:

V1 = (0.05 * 500) / 0.50 = 25 mL

So, you need to draw 25 mL of the 50% dextrose stock solution