Dilution and Standard Curve

1. What is dilution?

• The process of increasing the concentration of a solution
• The process of decreasing the concentration of a solution
• The process of mixing two solutions together
• The process of separating a solute from a solvent

2. What is the dilution factor?

• The ratio of the final volume to the initial volume of a solution
• The ratio of the initial volume to the final volume of a solution
• The ratio of the solute to the solvent in a solution
• The ratio of the solvent to the solute in a solution

3. Which of the following is an example of a serial dilution?

• Mixing two solutions of different concentrations
• Adding a solute to a solvent to create a solution
• Repeatedly diluting a solution to create a series of lower concentrations
• Concentrating a solution by removing the solvent

4. What is a standard curve used for?

• To determine the concentration of an unknown solution
• To measure the volume of a solution
• To calculate the dilution factor of a solution
• To separate a solute from a solvent

5. Which of the following is true about a standard curve?

• It is a graph showing the relationship between concentration and absorbance or other measurable property
• It is a graph showing the relationship between volume and concentration of a solution
• It is a graph showing the relationship between dilution factor and concentration of a solution
• It is a graph showing the relationship between solute and solvent in a solution

6. When performing a serial dilution, each subsequent dilution is usually done by:

• Adding more solute to the solution

• Adding more solvent to the solution
• Reducing solute in the solution

• Reducing solvent in the solution

7. What is the purpose of a blank control in a standard curve analysis?

• To determine the concentration of the unknown sample.

• To calibrate the spectrophotometer.

• To account for background noise and reagent impurities.

• To calculate the dilution factor.

8. Which of the following is NOT a factor that can affect the accuracy of a standard curve?

• Pipetting errors

• Temperature fluctuations

• Sample viscosity

• pH of the solvent

9. What is the relationship between dilution factor and concentration?

• As the dilution factor increases, the concentration decreases
• As the dilution factor increases, the concentration increases

• Dilution factor and concentration are unrelated

• Dilution factor is equal to concentration

10. Which of the following is an example of a dilution calculation?

• Calculating the boiling point of a solution

• Determining the concentration of a stock solution

• Measuring the volume of a solvent used in a reaction

• Estimating the pH of a diluted solution