Question

You need to make 1.25 L of 0.850 M sodium hydroxide. What volume of a 6.0 M stock solution do you need to measure out?

Answer 1

To make 1.25 L of 0.850 M sodium hydroxide, you need to dilute 177.1 mL of a 6.0 M NaOH stock solution to the desired final volume.

Step-by-step explanation:

The question asks how to use dilution to prepare a desired concentration and volume of sodium hydroxide (NaOH) from a more concentrated stock solution. The dilution formula can be applied, which is C1V1 = C2V2, where C1 and V1 are the concentration and volume of the stock solution, and C2 and V2 are the concentration and volume of the desired diluted solution.

Here's how you calculate:
0.850 M (desired concentration) × 1.25 L (desired volume) = 6.0 M (stock solution concentration) × V1 (volume of stock solution needed)
V1 = (0.850 M × 1.25 L) / 6.0 M
V1 = 1.0625 L / 6.0 M
V1 = 0.1771 L or 177.1 mL

You would need to measure out 177.1 mL of the 6.0 M stock NaOH solution and dilute it to a final volume of 1.25 L to create a 0.850 M NaOH solution.