11CHE M2 IQ3 Standard Solutions Quiz

What is the primary purpose of a standard solution in analytical chemistry?

• To measure the pH of a solution

• To determine the concentration of another solution

• To change the color of a solution

• To increase the volume of a solution

Answer explanation

The primary purpose of a standard solution in analytical chemistry is to determine the concentration of another solution.

Which formula is used to calculate the amount of solvent and solute needed for preparing a standard solution?

• C1V1 = C2V2

• A1B1 = A2B2

• D1E1 = D2E2

• M1N1 = M2N2

Answer explanation

The correct formula used to calculate the amount of solvent and solute needed for preparing a standard solution is C1V1 = C2V2.

What does C1 represent in the formula C1V1 = C2V2?

• The final concentration of the standard solution

• The initial volume of the solute

• The initial concentration of the solute

• The final volume of the standard solution

Answer explanation

C1 represents the initial concentration of the solute in the formula C1V1 = C2V2.

Why is it important to use deionized water when preparing the solvent for a standard solution?

• To ensure the solution has a color

• To increase the solution's viscosity

• To avoid any contamination

• To make the solution boil faster

Answer explanation

To avoid any contamination

What should be done after the solute is completely dissolved in the solvent?

• The solution should be heated.

• The remaining solvent should be added to reach the desired volume.

• The solution should be discarded.

• The pH of the solution should be adjusted.

Answer explanation

After the solute is completely dissolved in the solvent, the remaining solvent should be added to reach the desired volume to create the final solution.

What should be included when labeling the container of the standard solution?

• The weight of the container

• The temperature of storage

• Concentration, date of preparation, and other relevant details

• The name of the person who prepared the solution

Answer explanation

Concentration, date of preparation, and other relevant details should be included when labeling the container of the standard solution.

What is the volume of a 1 M NaCl stock solution needed to prepare 500 mL of a 0.1 M NaCl solution?

• A) 50 mL

• B) 100 mL

• C) 5 mL

• D) 500 mL

Answer explanation

To prepare 500 mL of 0.1 M NaCl solution, you need 50 mL of 1 M NaCl stock solution (0.1 M * 500 mL / 1 M = 50 mL). Therefore, the correct answer is A) 50 mL.

Why is it important to double-check your calculations and measurements when preparing a standard solution?

• A) To ensure the accuracy of the standard solution

• B) To change the concentration of the solution

• C) To make the solution boil

• D) To reduce the amount of solvent needed

Answer explanation

To ensure the accuracy of the standard solution

What is the significance of using a volumetric flask in the preparation of standard solutions?

• To mix the solution thoroughly

• To measure the pH of the solution

• To ensure precise volume measurements

• To heat the solution evenly

Which step is crucial after adding all components but before finalizing the volume of a standard solution?

• Heating the solution to a specific temperature

• Adjusting the pH of the solution

• Mixing the solution thoroughly

• Labeling the container immediately