Molarity and Dilutions Review Lesson

Dilutions and Molarity Calculations

take notes on paper/chromebook

Multiple Choice

What is a mole?

• 6.022 x 10²³ items

• a fuzzy critter

• a chemistry thing

REVIEWING:

Calculating Molar Mass

• Na₂CO₃

• Ca(NO₃)₂

Fill in the Blank

What is the Molar Mass of CO₂?

Multiple Choice

A measure of how much solute is dissolved in solution or "strength" of solution is called......

• concentrated

• concentration

• dilute

• dilution

Multiple Choice

How do chemists describe the "strength" or concentration of a solution?

• molarity

• concentrated

• diluted

• strong

Multiple Choice

How do chemists calculate molarity?

• grams/mole

• moles/Liter

• ounces/container

Multiple Choice

What is the molarity of 0.50 moles of NaCl in 0.25 L of solution

• 1 M

• 1/2 M

• 2 M

• 1.5 M

Multiple Choice

The higher the molarity, the ________ the solution

• more concentrate

• less concentrated

Multiple Choice

The lower the molarity, the ________ the number of particles in the solution

• fewer

• greater

Dilution

• Dilution is the process of adding more solvent to a solution

• A typical dilution calculation involves determining how much water must be added to an amount of stock solution to achieve a solution of the desired concentration

Dilution calculation formula

• Our basic formula is: M₁ X V₁ = M₂ X V₂

• M stands for molarity and V stands for volume

Practice problem

• What volume of 16 M sulfuric acid must be used to prepare 1.5L of a .10 M H₂SO₄ solution?

Fill in the Blank

What volume of 12 M HCl must be taken to prepare .75L of .25 M HCl?

Fill in the Blank

What volume of 19 M NaOH must be used to prepare 1.0 L of a 0.15 M NaOH solution?