Idea Transcript
Dilution Lab
Dilution Lab
Purpose: To understand the concept of molarity and dilution by creating solution of specific concentrations. Pre-Lab Questions: 1) Explain how to create a dilute solution from a concentrated solution. 2) Determine the molar mass of Kool-Aid, assuming the chemical formula for Kool-Aid is C12H22O11. 3) What mass of Kool-Aid is needed to make 100 mL of a 1.0 M solution? 4) A chemist makes two Kool-Aid solutions with different concentrations. Solution A is made by dissolving 50.0 g of Kool-Aid in 400 mL of water. Solution B is made by dissolving 50.0 g of Kool-Aid in 200 mL of water. What can be said about the solution’s concentrations? (Use at least three of the following terms in your explanation: saturated, dilute, homogenous, unsaturated, supersaturated, solvent, solute, solution) Procedures: (SUMMARIZE IN NOTEBOOK) In the plastic measuring cup, measure the mass of Kool-Aid you calculated in #3 from your Pre-Lab questions. Add drinking water until you reach the 100 mL mark. Stir with plastic stirrer. Pour 50 mL in tasting cup. Taste the solution from the tasting cup. Record taste and color of the solution. In the measuring cup, add water until you reach the 100 mL mark. Stir with plastic stirrer. Pour 50 mL in tasting cup. Taste the solution from the tasting cup. Record taste and color of the new solution. Repeat last step 3 more times. Clean up station. Rinse out all cups used. Only throw away tasting cup. Data Tables: (DRAW IN YOUR NOTEBOOK)
Purpose: To understand the concept of molarity and dilution by creating solution of specific concentrations. Pre-Lab Questions: 1) Explain how to create a dilute solution from a concentrated solution. 2) Determine the molar mass of Kool-Aid, assuming the chemical formula for Kool-Aid is C12H22O11. 3) What mass of Kool-Aid is needed to make 100 mL of a 1.0 M solution? 4) A chemist makes two Kool-Aid solutions with different concentrations. Solution A is made by dissolving 50.0 g of Kool-Aid in 400 mL of water. Solution B is made by dissolving 50.0 g of Kool-Aid in 200 mL of water. What can be said about the solution’s concentrations? (Use at least three of the following terms in your explanation: saturated, dilute, homogenous, unsaturated, supersaturated, solvent, solute, solution) Procedures: (SUMMARIZE IN NOTEBOOK) In the plastic measuring cup, measure the mass of Kool-Aid you calculated in #3 from your Pre-Lab questions. Add drinking water until you reach the 100 mL mark. Stir with plastic stirrer. Pour 50 mL in tasting cup. Taste the solution from the tasting cup. Record taste and color of the solution. In the measuring cup, add water until you reach the 100 mL mark. Stir with plastic stirrer. Pour 50 mL in tasting cup. Taste the solution from the tasting cup. Record taste and color of the new solution. Repeat last step 3 more times. Clean up station. Rinse out all cups used. Only throw away tasting cup. Data Tables: (DRAW IN YOUR NOTEBOOK)
Color
Taste
Color
Stock (1 M solution)
Stock (1 M solution)
1st Dilution
1st Dilution
2nd Dilution
2nd Dilution
3rd Dilution
3rd Dilution
4th Dilution
4th Dilution
Taste
Post Lab Questions: Complete the table. Determine the new concentration of the solutions using the dilution equation. Using Molarity equation and t-chart to find grams of Kool-Aid. Show all work. M1
V1
V2
M2
Post Lab Questions: Complete the table. Determine the new concentration of the solutions using the dilution equation. Using Molarity equation and t-chart to find grams of Kool-Aid. Show all work.
g of Kool-Aid
M1
Stock
Stock
1st Dilution
1st Dilution
2nd Dilution
2nd Dilution
3rd Dilution
3rd Dilution
4th Dilution
4th Dilution
If you were working for the Kool-Aid company, which concentration would you recommend to customers? Explain using evidence from your lab to support your claim. How did the color of the solution change with each dilution? What are the benefits of having a stock solution to make dilutions? How did the concentration of the solutions change with each dilution? How do you use dilutions in your everyday life?
V1
V2
M2
g of Kool-Aid
If you were working for the Kool-Aid company, which concentration would you recommend to customers? Explain using evidence from your lab to support your claim. How did the color of the solution change with each dilution? What are the benefits of having a stock solution to make dilutions? How did the concentration of the solutions change with each dilution? How do you use dilutions in your everyday life?
Conclusion: In a paragraph, state findings and relate to purpose of experiment. If you could do something different to improve the lab, what would it be? What did you learn from the lab?
Conclusion: In a paragraph, state findings and relate to purpose of experiment. If you could do something different to improve the lab, what would it be? What did you learn from the lab?
**Pre-Lab Instructions** Title, lab partners Write purpose & procedures Write Pre-lab questions & Answer them Write Data Tables section
**Pre-Lab Instructions** Title, lab partners Write purpose & procedures Write Pre-lab questions & Answer them Write Data Tables section
**Post-Lab Instructions** Complete Data Tables Write Post-Lab questions & answer them Complete the conclusion section
**Post-Lab Instructions** Complete Data Tables Write Post-Lab questions & answer them Complete the conclusion section