Dilution and Concentration Concepts

This video tutorial by Wise Guys explains the concept of dilution, where adding more solvent to a solution decreases its concentration while the amount of solute remains constant. Two examples are provided: one involving a sodium chloride solution and another with an antibiotic solution. The video demonstrates how to calculate the required volume of a concentrated solution to achieve a desired diluted concentration, emphasizing the importance of keeping the solute amount constant during dilution.

What happens to the concentration of a solution when more solvent is added?

• It doubles.

• It increases.

• It decreases.

• It remains the same.

In a dilution, which component remains unchanged?

• Volume

• Solute

• Concentration

• Solvent

What is the concentration of a solution if it contains 0.9 grams of solute in 100 ml of solution?

• 90%

• 0.09%

• 0.9%

• 9%

How many milliliters of a 15% sodium chloride solution are needed to make 1500 ml of a 0.9% solution?

• 15 ml

• 900 ml

• 150 ml

• 90 ml

What is the first step in solving a dilution problem?

• Measure the initial concentration.

• Add more solvent.

• Determine the amount of solute.

• Calculate the final volume.

In the sodium chloride example, what is the mass of solute needed?

• 135 grams

• 0.135 grams

• 1.35 grams

• 13.5 grams

How much solvent should be added to 5 ml of a 50 mg/ml antibiotic solution to decrease the concentration to 1%?

• 5 ml

• 20 ml

• 25 ml

• 15 ml

What is the final volume of the antibiotic solution after dilution?

• 5 ml

• 25 ml

• 10 ml

• 30 ml

What is the concentration of a solution if it contains 1 gram of solute in 100 ml of solution?

• 0.1%

• 100%

• 1%

• 10%

In the antibiotic solution problem, what remains constant during dilution?

• Concentration

• Solute

• Solvent

• Volume