This document discusses molarity, which is defined as the number of moles of solute per liter of solution. Molarity is calculated by taking the moles of solute and dividing by the total liters of solution. The document provides an example calculation of molarity using 0.40 moles of NaCl dissolved in 0.250L of water, and gives a sample problem of calculating the molarity of 58.44 grams of NaCl dissolved in 2.00L of solution. Two practice problems are included at the end to test the reader's understanding of calculating molarity.

1. General Chemistry 2
Ways of expressing
concentration of solutions.
“MOLARITY”
-

2. Molarity
• the number of moles of Solute
(the material dissolved) per liter
of solution.
-https://www.chemicool.com/definition/molarity.html

3. • is the number of moles of the
solute contained in one liter of
the solution.
-http://www.solitaryroad.com/c1504.html
Molarity

4. Example
• Adding salt (NaCl) in some volume of
water (H2O).

5. Calculation
Two information are needed:
• The moles of solute present in the
solution.
• The volume of solution (in liters)
containing the solute.

6. Formula

7. Example Problem:
What is the molarity of a 0.40 moles of NaCl
dissolved in 0.250L of water?
Answer:
1.6M

8. Solution:
M=
M= 1.6 moles/L
.40moles
.250L

9. Suppose you had 58.44 grams
of NaCl and you dissolved it in
exactly 2.00 L of solution.
What would be the molarity of
the solution?
Sample Problem:

10. M= 0.500
Answer:

11. Solution:
1. Convert grams to moles.

12. 2. Perform the standard formula.

13. quiz

14. 1) Calculate the molarity of 25.0 grams of
KBr dissolved in 750.0 mL.
2) 80.0 grams of glucose (C6H12O6,
mol. wt = 180. g/mol) is dissolved
in enough water to make 1.00 L of
solution. What is its molarity?

15. Thank you!