Dilution and Molarity Calculations

This video tutorial by Wise Guys covers dilution calculations using the formula M1V1 = M2V2. It explains the concept of molarity and how to calculate the concentration of a solution after dilution. The tutorial includes three examples: diluting potassium chloride, sodium hydroxide, and hydrochloric acid solutions. Each example demonstrates the step-by-step process of identifying the concentrated and diluted solutions, applying the formula, and calculating the final concentration.

What is the primary formula used for dilution calculations?

• M1V1 = M2V2

• C1V1 = C2V2

• P1V1 = P2V2

• D1V1 = D2V2

In the formula M1V1 = M2V2, what does M1 represent?

• Volume of diluted solution

• Concentration of stock solution

• Concentration of diluted solution

• Volume of stock solution

Why is it important to use the same units for V1 and V2 in dilution calculations?

• To ensure the units cancel out

• To make the calculation easier

• To avoid conversion errors

• To increase accuracy

What is the molarity of a solution prepared by diluting 30 mL of 5.0 M stock solution to 120 mL?

• 1.25 M

• 2.50 M

• 5.00 M

• 3.75 M

When diluting a solution, what remains constant?

• Temperature of the solution

• Volume of the solution

• Concentration of the solution

• Number of moles of solute

How do you calculate the final volume of a solution after adding water?

• Subtract the initial volume from the added volume

• Add the initial volume to the added volume

• Multiply the initial volume by the added volume

• Divide the initial volume by the added volume

What is the molarity of a solution after adding 25 mL of water to 10 mL of 0.4 M solution?

• 0.400 M

• 0.114 M

• 0.200 M

• 0.300 M

How many milliliters of 12.0 M HCl are needed to make 3,000 mL of 0.1 M HCl?

• 75 mL

• 50 mL

• 100 mL

• 25 mL

What is the purpose of using the formula M1V1 = M2V2 in dilution problems?

• To find the temperature change

• To calculate the change in pressure

• To determine the concentration change

• To measure the pH level

In a dilution calculation, if the initial concentration is high, what happens to the final concentration?

• It becomes higher

• It becomes lower

• It doubles

• It remains the same