Dilution Factors and Concentration Calculations

The video tutorial explains how to create a diluted solution from a stock solution by using a specific volume of the stock and adding it to a dilutant. It covers calculating the total volume, applying the dilution equation, determining the dilution factor, and finding the final concentration of the working solution. The tutorial concludes with a verification of the process to ensure the correct application of the dilution factor.

What is the initial concentration of the stock solution used in the example?

• 438 millimolar

• 144 millimolar

• 6.4 millimolar

• 138.4 millimolar

How is the total volume of the solution calculated?

• By dividing the volume of the stock solution by the volume of the dilutant

• By subtracting the volume of the stock solution from the volume of the dilutant

• By multiplying the volume of the stock solution by the volume of the dilutant

• By adding the volume of the stock solution to the volume of the dilutant

What is the total volume of the solution after mixing the stock and dilutant?

• 138.4 milliliters

• 144.8 milliliters

• 438 milliliters

• 6.4 milliliters

What equation is used to relate the concentrations and volumes of the stock and diluted solutions?

• c1 + v1 = c2 + v2

• c1/v1 = c2/v2

• c1v1 = c2v2

• c1 - v1 = c2 - v2

What is the purpose of rearranging the dilution equation?

• To measure the temperature of the solution

• To determine the volume of the stock solution

• To find the concentration of the diluted solution

• To calculate the pH of the solution

How is the dilution factor calculated?

• By dividing the volume of the stock solution by the total volume

• By multiplying the volume of the stock solution by the total volume

• By subtracting the volume of the stock solution from the total volume

• By adding the volume of the stock solution to the total volume

What is the dilution factor obtained in the example?

• 1 in 22.6

• 1 in 50

• 1 in 10

• 1 in 100

What does the dilution factor indicate in this context?

• The ratio of the stock solution volume to the total volume

• The temperature change during dilution

• The color change of the solution

• The pH level of the diluted solution

What is the concentration of the working solution after dilution?

• 6.4 millimolar

• 144 millimolar

• 438 millimolar

• 19.4 millimolar

Why is it important to verify the concentration of the working solution?

• To determine the pH level of the solution

• To ensure the dilution factor was applied correctly

• To check if the stock solution is expired

• To confirm the color of the solution