Laboratory Solution Preparation Techniques

This video tutorial guides students through the Kool-Aid molarity lab procedure. It uses copper II sulfate as an example to demonstrate how to calculate the moles and grams of solute needed for a solution. The video covers the preparation of a 50 mL solution, including the use of a volumetric flask and deionized water. It emphasizes the importance of accuracy in measuring and mixing the solution, as well as the need to match the solution's color to a target. The tutorial concludes with a reminder to clean up the lab station to maintain a safe and organized environment.

What is the main difference between the example procedure and the actual lab task?

• The type of solute used

• The volume of solution prepared

• The temperature of the solution

• The equipment used

Which formula is used to calculate the amount of solute needed?

• Concentration formula

• Volume formula

• Molarity formula

• Density formula

How do you convert milliliters to liters in the calculation?

• Multiply by 100

• Divide by 1000

• Divide by 100

• Multiply by 1000

What is the purpose of using weighing paper in the lab?

• To measure the volume of the solution

• To prevent contamination of the solute

• To accurately measure the mass of the solute

• To protect the balance from damage

Why is it important to zero the balance before measuring the solute?

• To save time during the experiment

• To calibrate the balance

• To avoid errors in mass measurement

• To ensure the balance is clean

What type of water should be used to fill the volumetric flask?

• Tap water

• Mineral water

• Distilled water

• Deionized water

What should you do if you accidentally overfill the volumetric flask?

• Add more solute to balance it

• Start over with a new solution

• Ignore and proceed with the experiment

• Remove some solution with a pipette

How can you ensure the solution is thoroughly mixed?

• Add more solute

• Swirl the flask gently

• Use a magnetic stirrer

• Shake the flask vigorously

What is the final check to ensure the solution is correct?

• Measure the pH level

• Test the temperature

• Check the color against a standard

• Weigh the solution

What is a common issue found at lab stations that needs to be addressed?

• Lack of equipment

• Incorrect measurements

• Messiness and leftover trash

• Insufficient time