1 / 16

Mastering Molarity and Molality: Understanding Concentration Measurements

Dive into the world of chemistry with M&M’s Molarity and Molality lessons. Learn how to calculate moles of solute with molarity, convert mass to moles, and understand the difference between molality and molarity. Get to grips with dilution calculations and solving for moles of solute accurately. Enhance your knowledge of standard solutions and become a pro at concentration measurements. Start your journey towards chemistry mastery today!

senalda-banderas
Download Presentation

Mastering Molarity and Molality: Understanding Concentration Measurements

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. M & M’s Molarity and Molality

  2. Concentration • The amount of solute in a given volume of solution • In chemistry, concentration goes by the stage name: Molarity (M)

  3. Molarity • Is the number of moles of solute per volume of solution in liters • It's the easiest measure for most aqueous solutions. Moles of Solutemol M = molarity = = Liters of Solution L

  4. Steps To Solve For Molarity • Set up you data table. • Covert: • Mass: into grams • Grams: into moles • work out the number of moles of the solute from the molecular weight (use T chart) • Volume: into liters (L) • Plug the numbers into your formula and solve.

  5. Solve for Moles of Solute • To convert a volume and a molarity (M) of a solution to moles of solute, simply solve for moles of solute using the molarity equation: moles solute = M X volume

  6. Molality • An alternative unit of concentration to molarity. • The molality of a solute is the number of moles of that solute divided by the weight of the solvent in kilograms.

  7. Molality Moles of Solute • For water solutions, 1 kg of water has a volume close to that of 1 liter, so molality and molarity are similar in dilute aqueous solutions. M = Mass of Solution

  8. Steps to Solve for Molality • Set up you data table. • Covert: • Mass of solute: into grams • Grams of solute: into moles • work out the number of moles of the solute from the molecular weight (use T chart) • Mass of solution: into grams • Plug the numbers into your formula and solve.

  9. Solve for Moles of Solute • molality (M) = moles solute/kg of solution • To convert a volume and a molality of a solution to moles of solute, simply solve the above equation for moles of solute: • moles solute = molality X kg of solution

  10. FYI • A solution that is 1.0 molar (written as 1.0 M) contains 1.0 mol of solute per liter of solution

  11. Molality

  12. Standard Solution • Is a solution whose concentration is accurately known.

  13. Dilution • The process of adding more solvent to a solution. • The key to doing a dilution calculation: only water is added in the dilution

  14. Dilution continued • Moles of solute after dilution = Moles of solute before dilution Remains constant Moles of Solute M = Volume (L) decreases Increases (more water)

  15. HUH?!! 1 mol 1 mol Molarity > Molarity

  16. Putting It To Work Final Conditions Initial Conditions M1 X V1 = moles of solute = M2 X V2

More Related