Molarity and Dilutions Unit : Chp. 12.5
12.5 Molarity and Dilution
 Molarity Equation
 Grams-to-moles-to-Molarity and Vice-versa
 Grams-to-moles-to- volume and Vice-versa
 Dilution Equation
 Preparing Solutions
I Can Statements:
(12.5) Molarity and Dilution
1. Define and explain the term Molarity
2. Write and explain each term in the Molarity Equation
3. Solve for ANY variable in the molarity equation when given the value of all other variables
4. Use the molarity equation to determine number of grams
6. Start with number of grams and determine molarity and/ or volume
7. Write and explain each term in the Dilution Equation
8. Solve for ANY variable in the dilution equation when given the value of all other variables
9. Define and explain the term Stock Solution
10. Prepare stock solutions
11. Prepare dilutions
Vocabulary 12.5
Dilution
Molarity
Stock Solution
Volumetric Flask
Equations 12.5
Molarity (M) =
𝐌𝐨𝐥𝐞𝐬 𝐨𝐟 𝐒𝐨𝐥𝐮𝐭𝐞
𝐋𝐢𝐭𝐞𝐫𝐬 𝐨𝐟 𝐒𝐨𝐥𝐮𝐭𝐢𝐨𝐧
Dilution : C1V1 = C2V2
Achievement Scale 12.5
Goal
12.5
Molarity
and
Dilution
C Level
 Can define and explain the term molarity
 Can write and explain each term in the
molarity equation
 Can solve for molarity when given moles and
volume
 Can define the term stock solution
 Can write and explain each term in the
dilution equation
B Level
 Can solve for any variable
in the dilution equation
when supplied with all
other variables
 Can determine volume
when given molarity and
moles
 Can determine moles
when given molarity and
volume
A Level
 Can start with
grams and
calculate
molarity
and/or volume
 Can use the
molarity
equation to
calculate
grams
1
Sample Questions 12.5
C Level:
1. What is the molarity of 0.0250 moles of NaCl dissolved in 500. mL of water?
B Level:
2. How many mL of a 0.0500 M stock solution of NaCl are needed to make 0.500 L of 0.0100 M solution?
A Level:
1. How many grams of NaCl are required to make 250.0 mL of a 0.100 M solution?
2