Ethanol Solution Preparation Concepts

This video tutorial explains how to use the C1V1=C2V2 equation to prepare a diluted ethanol solution for an experiment involving daphnia. It covers setting up the experiment, understanding ethanol concentrations, and applying the equation to calculate the necessary volume of stock solution. The tutorial concludes with preparing the final solution by mixing the calculated volume of stock with water.

What is the primary purpose of using the C1V1 = C2V2 equation in the experiment described?

• To find the volume of stock solution needed to create a new solution

• To calculate the heart rate of daphnia

• To measure the temperature of the ethanol solution

• To determine the concentration of ethanol in the stock solution

Why is the 10% ethanol stock solution considered unsuitable for direct use with daphnia?

• It is too expensive

• It has too high of an ethanol concentration

• It is not pure enough

• It is too diluted

What is the desired concentration of the new ethanol solution for the experiment?

• 5%

• 2%

• 10%

• 20%

Which variable represents the volume of the new solution to be made?

• V1

• C1

• V2

• C2

What is the known concentration of the stock solution in the problem?

• 2%

• 20%

• 10%

• 5%

How do you simplify the equation to solve for V1?

• Multiply all terms by 10

• Cancel the percent signs and divide

• Subtract the volumes

• Add the concentrations

What is the calculated volume of the stock solution needed to make the final solution?

• 8 milliliters

• 2 milliliters

• 4 milliliters

• 6 milliliters

How much water is needed to dilute the stock solution to achieve the desired concentration?

• 14 milliliters

• 12 milliliters

• 16 milliliters

• 10 milliliters

What is the total volume of the new ethanol solution to be prepared?

• 40 milliliters

• 10 milliliters

• 20 milliliters

• 30 milliliters

What is the final step in preparing the new ethanol solution?

• Heating the solution

• Mixing the stock with water

• Filtering the solution

• Adding more ethanol