Write a brief description of the procedure required to make 10mL each of 2 M, 1.5 M, and 1 M NaCl solution from a 2 M Stock NaCl. Write the description.

To make 10 mL each of 2 M, 1.5 M, and 1 M NaCl solutions from a 2 M stock NaCl solution, you will need to perform a series of dilutions. Here's a step-by-step description of the procedure:

1. Prepare three separate 10 mL volumetric flasks for each desired concentration (2 M, 1.5 M, and 1 M).

2. Start with the 2 M stock NaCl solution and determine the required volumes needed for each dilution using the formula: C₁V₁ = C₂V₂. Here, C₁ represents the initial concentration (2 M), V₁ is the initial volume, C₂ is the final concentration, and V₂ is the final volume (10 mL).

3. For the 2 M NaCl solution: Calculate the volume of the stock solution needed to achieve a 2 M concentration in a 10 mL final volume. Since the stock solution is already 2 M, no further dilution is required. Therefore, transfer 10 mL of the stock NaCl solution into one of the volumetric flasks.

4. For the 1.5 M NaCl solution: Calculate the volume of the stock solution needed to achieve a 1.5 M concentration in a 10 mL final volume. Use the formula C₁V₁ = C₂V₂, where C₁ is 2 M, V₁ is the unknown volume to calculate, C₂ is 1.5 M, and V₂ is 10 mL. Rearrange the equation to solve for V₁: V₁ = (C₂V₂) / C₁. Substituting the values, V₁ = (1.5 M * 10 mL) / 2 M = 7.5 mL. Therefore, transfer 7.5 mL of the stock NaCl solution into the second volumetric flask.

5. For the 1 M NaCl solution: Calculate the volume of the stock solution needed to achieve a 1 M concentration in a 10 mL final volume using the same formula. V₁ = (C₂V₂) / C₁ = (1 M * 10 mL) / 2 M = 5 mL. Transfer 5 mL of the stock NaCl solution into the third volumetric flask.

6. Once the appropriate volumes for each concentration have been measured, add distilled water to each volumetric flask up to the 10 mL mark. To do this, use a dropper or pipette to carefully add the water drop by drop until the liquid reaches the mark on each flask.

7. After adding the water, gently swirl or mix each flask to ensure thorough mixing of the NaCl with the water.

Now, you have successfully prepared 10 mL each of 2 M, 1.5 M, and 1 M NaCl solutions from a 2 M stock NaCl solution.