Calculating Molarity

The video tutorial explains the concepts of molarity and concentration, highlighting their importance in chemical solutions. It discusses the difference between the two terms, focusing on the units used to express them. The tutorial provides a simple equation for calculating molarity and includes several practice problems to reinforce learning. The importance of understanding concentration is illustrated with a real-world example involving cadmium pollution.

Why is it important for a chemical factory to monitor the concentration of cadmium in its waste?

• To increase the efficiency of chemical reactions

• To prevent harm to aquatic life and humans

• To ensure the waste is not too acidic

• To reduce the cost of waste disposal

What is the primary difference between molarity and concentration?

• Molarity uses moles per liter, concentration can use various units

• Molarity is a broader term than concentration

• Molarity is specific to gases, concentration to liquids

• Molarity is measured in grams, concentration in liters

How is molarity calculated?

• By adding the moles of solute to the volume of solvent

• By dividing the moles of solute by the volume of solution in liters

• By dividing the mass of solute by the volume of solvent

• By multiplying the moles of solute by the volume of solution

If 0.25 moles of silver nitrate are dissolved in 0.075 liters of water, what is the molarity?

• 2.5 M

• 3.3 M

• 0.33 M

• 1.5 M

What is the molarity of a solution with 0.0748 grams of sodium bromide in 25.0 cm³ of water, given the molar mass of sodium bromide is 102 g/mol?

• 1.02 x 10^-1 M

• 2.93 x 10^-2 M

• 3.00 x 10^-2 M

• 7.33 x 10^-4 M