1 / 6

Diluting a Solution

Diluting a Solution. Most solutions are stored in concentrated form and diluted for use when required. To dilute to the required concentration we must extract the number of moles required from the stock solution and place them in the new flask. Fill it with water and we are done.

livana
Télécharger la présentation

Diluting a Solution

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Diluting a Solution • Most solutions are stored in concentrated form and diluted for use when required. • To dilute to the required concentration we must extract the number of moles required from the stock solution and place them in the new flask. • Fill it with water and we are done

  2. The number of moles does not change when you dilute the solution, therefore: • Since n = Cv in both beakers, we can write the relationship as : • Civi = CfvfCi = Concentration of the initial solutionvi = volume of the initial solutionCf = Concentration of the final solutionvf = volume of the final solution

  3. EXAMPLE 1 • What volume of 12.4 mol/L hydrochloric acid is required to prepare 2.00 L of 0.250 mol/L solution.- note: whenever you want to prepare something, this will be a final concentration or volume

  4. ANSWER • Civi = Cfvf • 12.4 M (v) = 2.00 L x 0.250 M • v= (2.00L) x (0.250M/12.4M) • v = 0.0403 L or 40.3 mL

  5. EXAMPLE 2 • What is the concentration of the diluted acetic acid if 200 mL of 17.4 M is pipette into a 500 mL flask and brought up to the full volume?

  6. ANSWER #2 • Civi = Cfvf (note:200mL=0.200L) • 17.4 M x 0.200 L = Cf x 0.500 L • Cf = 6.96 M

More Related