1 / 11

Molarity

Molarity. Concentration Based on Mass. Concentration - amount of solute dissolved in a given amount of solution Concentration of a solution has an effect on Physical properties Melting and boiling points Chemical properties Solution reactivity. Moles and Equivalents.

mattox
Download Presentation

Molarity

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. Molarity

  2. Concentration Based on Mass • Concentration - amount of solute dissolved in a given amount of solution • Concentration of a solution has an effect on • Physical properties • Melting and boiling points • Chemical properties • Solution reactivity

  3. Moles and Equivalents • Chemical equations represent the relative number of moles of reactants producing products • Many chemical reactions occur in solution where it is most useful to represent concentrations on a molar basis

  4. Molarity • The most common mole-based concentration unit is molarity • Molarity • Symbolized M • Defined as the number of moles of solute per liter of solution

  5. Molarity 2M HCl What does this mean?

  6. Molarity Calculations MASS IN GRAMS MOLES NUMBER OF PARTICLES LITERS OF SOLUTION 6.02  1023 (particles/mol) molar mass (g/mol) Molarity (mol/L)

  7. Calculating Molarity from Moles • Calculate the molarity of 2.0 L of solution containing 5.0 mol NaOH • Use the equation • Substitute into the equation: MNaOH = 5.0 mol solute 2.0 L solution = 2.5 M

  8. Molarity Calculations How many grams of NaCl are required to make 0.500L of 0.25M NaCl? 0.500 L 0.25 mol 1 L 58.44 g 1 mol = 7.3 g NaCl

  9. Molarity Calculations Find the molarity of a 250 mL solution containing 10.0 g of NaF. M = 10.0 g 1 mol 41.99 g = 0.238 mol NaF 0.238 mol 0.25 L = 0.95M NaF

  10. Molar Volume of a Gas • Molar volume- the volume occupied by 1 mol of any gas • STP – Standard Temperature and Pressure • T = 273 K (or 0oC) • P = 1 atm • At STP the molar volume of any gas is 22.4 L • Vgas = molesgas x (22.4L/1 mol)

  11. Molar Mass and Density • A gas’s density will determine if it will sink or float in the air • Molar mass = density x molar volume • At STP

More Related