Understanding Molarity

This video tutorial covers the concept of molarity, starting with basic definitions of solutions, solute, and solvent. It explains concentration, including terms like dilute and concentrated, using examples such as salt water and Kool-Aid. The tutorial then introduces molarity as a unit of concentration, detailing the formula and importance of using liters. It provides examples of calculating molarity and solving more complex problems involving algebraic rearrangement of the formula.

What is a solution?

• A solid dissolved in a liquid

• A mixture of substances that is uniform in composition

• A single substance with no mixture

• A mixture where components are easily distinguished

In a saltwater solution, what is the solute?

• Water

• Salt

• Both salt and water

• Neither salt nor water

What does it mean if a solution is described as 'dilute'?

• It has a high amount of solute

• It has a balanced amount of solute and solvent

• It has no solute

• It has a low amount of solute

How does adding more solvent affect the concentration of a solution?

• Increases the concentration

• Decreases the concentration

• Has no effect on concentration

• Doubles the concentration

What is the formula for molarity?

• Liters of solution over moles of solute

• Moles of solute over liters of solution

• Moles of solvent over liters of solution

• Moles of solute over liters of solvent

Why is it important to use liters in the molarity formula?

• Because milliliters are too small

• To ensure the molarity calculation is correct

• Liters are easier to measure

• It is a standard unit for all calculations

If a solution has 2 moles of solute in 5 liters, what is its molarity?

• 5 M

• 2.5 M

• 0.4 M

• 0.5 M

How many moles are in 370 milliliters of a 2.5 M solution?

• 1.25 moles

• 0.37 moles

• 0.93 moles

• 0.925 moles

What is the volume of a 0.75 M solution made from 1.3 moles of solute?

• 1.7 liters

• 2.0 liters

• 1.3 liters

• 0.75 liters

What is the rearranged formula to find volume in a molarity equation?

• Volume = Moles x Molarity

• Volume = Moles / Molarity

• Volume = Molarity / Moles

• Volume = Moles + Molarity