{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

lecture7 (10-13-2006) Ch 4-5

lecture7 (10-13-2006) Ch 4-5 - Chemistry 2A-c...

Info icon This preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Chemistry 2A Chemistry 2A - c F2006 c F2006 (Ch4 (Ch4 - 6)41: 6)41: Chemical Reactions Chemical Reactions III. Chemical Reaction in solution Solution Terminology Solvent : Substance in greatest proportion Solute : All other substances in solution Aqueous Solution : Water is the solvent Saturated : contains the maximum amount of dissolved solute the solution can hold Unsaturated Supersaturated Solubility of solute : amount of solute required to reach a saturated solution
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Chemistry 2A Chemistry 2A - c F2006 c F2006 (Ch4 (Ch4 - 7)42: 7)42: Chemical Reactions Chemical Reactions III. Chemical Reaction in solution Concentration of Aqueous Solutions Mass % One way of expressing the concentration of a solute in a solution is to report the % by mass. If we have 5.00 g of NaCl dissolved in100.0 g of water, we can calculate the % by mass . Mass % for NaCl = (5.00 g NaCl)x100/(105 g) = 4.76% Because of the convenience of measuring volumes of liquids, certain quantities of chemical are measured by their volume. A solution consists of one or more solutes (minor components) dissolved in a solvent (major component). Concentrations of solutions are expressed in moles of a solute in a certain volume of solution. Molarity (M) ( mol of solute/L of solution) = Number of moles of solute per liter of solution Solution: solute (minor component) + solvent (major component)
Image of page 2
Chemistry 2A Chemistry 2A - c F2006 c F2006 (Ch4 (Ch4 - 8)43: 8)43: Chemical Reactions Chemical Reactions Example : We can calculate the molarity of the NaCl solution above. We need to know the density of the solution (Given: density of the solution is 1.01 g/mL). Solution: Volume = 105 g/(1.01 g/mL) = 103.96 mL # mol of NaCl = (5 g NaCl) x[1 mol/(22.99 g + 35.45 g) = 0.086 mol Molarity = 0.086 mol/(0.10396 L) = 0.83 M Preparation of Aqueous Solutions Aqueous solutions are prepared by weighing out the proper amount of solute in grams, using a volumetric flask to measure the volume and adding enough water to give the final volume of the solution.
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern