Download presentation

Presentation is loading. Please wait.

1
**Preparing a Molar Solution**

How many grams of sucrose (C12H22O11) is needed to prepare one liter of a 1.50 M solution? You’ll need the molar mass of sucrose: 1.5 mol g _____________ X ___________ = 513 g / liter 1 liter mol

2
**Preparing a Molar Solution**

How many grams of sucrose (C12H22O11) is needed to prepare 100 mL of a 1.50 M solution? 1.5 mol g _____________ X ___________ = 513 g / liter 1 liter mol 1 L g 100 mL X __________ X _____________ = 51.3 g 1000 mL L

3
Diluting Solutions Many solutions (acids) come in a concentrated liquid form called a stock solution To dilute this solution, you add more solvent (usually water or alcohol) The amount of solute does not change, so the amount of solution SO M1V1 = M2V2

4
Diluting Solutions What volume in milliliters of 2.00M calcium chloride (CaCl2) would you use to make .50 L of .300 M calcium chloride solution? .50 L X 1000 mL/1 L = 500 mL M1V1 = M2V2 2.00M x V1 = .300M x 500 mL V1 = .300M x 500 mL / 2.00M V1 = 75 mL

5
**Mole Fraction Another way to express concentration**

Need to know the number of moles of solute and solvent Abbreviated as X Xa = mole fraction of solvent = na / na + nb Xb = mole fraction of solute = nb / na + nb

6
Mole Fractions What is the mole fraction of water in an HCl solution containing 62.5% water and 37.5% HCl by mass? 62.5 g x 1mol / g = 3.47 mol H2O 37.5 g x 1mol / g = 1.03 mol HCl na / na + nb 3.47 mol H20 / 1.03 mol HCl mol H20 na = .771

Similar presentations

© 2020 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google