Percent by Volume Calculations

The video tutorial explains the concept of percent by volume, a method to measure concentration by dividing the volume of solute by the volume of solution and multiplying by 100. It provides three examples: calculating the percent by volume of ethanol in a solution, determining the percent by volume of acetic acid when diluted with water, and finding the volume of hydrogen peroxide needed for a 3% solution. Each example demonstrates the application of the formula and highlights the importance of correctly identifying solute, solvent, and solution.

What is the formula for calculating percent by volume?

• Volume of solvent divided by volume of solution times 100

• Volume of solution divided by volume of solute times 100

• Volume of solute divided by volume of solution times 100

• Volume of solute divided by volume of solvent times 100

In the first example, what is the total volume of the solution after ethanol is diluted?

• 335 milliliters

• 100 milliliters

• 85 milliliters

• 250 milliliters

What is the percent by volume of ethanol in the first example?

• 34%

• 50%

• 25%

• 40%

In the second example, what is the total volume of the solution?

• 220 milliliters

• 200 milliliters

• 210 milliliters

• 10 milliliters

Why is it important to distinguish between solution and solvent in the second example?

• To determine the correct temperature

• To calculate the correct volume of solute

• To ensure the solution is mixed properly

• To avoid confusion in the calculation

What is the percent by volume of acetic acid in the second example?

• 4.76%

• 5.00%

• 3.50%

• 6.00%

In the third example, what is the given percent by volume of hydrogen peroxide?

• 5%

• 3%

• 10%

• 2%

What is the total volume of the solution in the third example?

• 500 milliliters

• 300 milliliters

• 400 milliliters

• 600 milliliters

How many milliliters of hydrogen peroxide are needed for a 3% solution in the third example?

• 12 milliliters

• 10 milliliters

• 8 milliliters

• 15 milliliters

What mathematical operation is used to solve for the volume of solute in the third example?

• Cross-multiplication

• Multiplication

• Subtraction

• Addition