Download presentation

Presentation is loading. Please wait.

Published byBenjamin Tucker Modified over 8 years ago

1
Spring Semester, 2013 Mrs. L. Fox

2
Concentration The amount of a dissolved substance occupying a given volume of the solution

3
Dilute Solutions Contain few solute molecules

4
Concentrated Solutions Contain many solute molecules

5
Molarity The number of moles of solute dissolved in 1 liter of solution Symbol is M Units are mol/L A solution that is 0.75 M KCl Contains 0.75 mols of KCl in every liter

6
Make 1 liter of a 0.75 M solution of KCl Calculate the molar mass of KCl 1 mol K = 39.10 g/mol 1 mol Cl = 35.45 g/mol 1 mol KCl = 39.10 + 35.45 = 74.55 gKCl/mol

7
Convert the molarity to the sample mass required 0.75 M KCl = 0.75 molsKCl/L * 74.55 g/mol = 55.91 gKCl/L You need to add 55.91 g of KCl to 1 liter of water to make 0.75 M KCl solution

8
What if you want a smaller amount? To make 150 mL 55.91 g/L * 1 L/1000 mL * 150 mL = 8.39 gKCl

9
Molarity Calculations M = # mol solute/# L solution

10
What is the molarity of an aqueous solution containing 40.0 g of glucose (C 6 H 12 O 6 ) in 1.5 L of solution?

11
What is the molarity of a bleach solution containing 9.5 g of NaOCl per liter of bleach?

12
Calculate the molarity of 1.60 L of a solution containing 1.55 g of dissolved KBr.

13
Diluting Stock Solutions Sometimes, the molarity of a solution is not what you want You have to dilute the solution to get the molarity you do want For that, you use M 1 V 1 = M 2 V 2 (In Chem Reference Sheet)

14
What volume would you use to make 0.50 L of 0.300 M CaCl 2 solution?

15
21) What volume of a 3.00 M KI solution would make 0.300 L of a 1.25 M solution?

16
How many mL of 5.0M solution to prepare 100.0mL of 0.25 M H 2 SO 4 ?

Similar presentations

© 2024 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