Describe how you would prepare the following two solutions. Be sure to include the type of glassware which you would use and as much detail as necessary for someone to actually prepare the solution using good laboratory technique.

• 250 mLs of a 5% NaCl (w/v) from solid NaCl

• 250 mLs of 3 M HNO3 from concentrated nitric acid which is 15.8 M

Both of them can be prepared in a beaker, however, the conc acid should be kunder a hood with a stirrer working.

a)massNaCL=58*.05*250*250
b) you are diluting it 15.8/3=5.27 times, which means 1 part conc acid, and 4.27 water.
Waht is one part?250/5.27=??? do that.
Now since acid has to be added to water, while stirring, put in the water in the beaker with the stirrer working, tha is 4.27*250/5.27 ml water, or 203 ml water.
then measure out in a gradusted cylinder the one part of conc acid, under the fume hood, wearing gloves, and eye protection 250/5.27=47ml of acid.
slowly pour the acid into the water, with vent on, and stirrer on.

To prepare a 250 mL solution of 5% NaCl (w/v) from solid NaCl, follow these steps using the appropriate glassware and good laboratory technique:

Step 1: Calculation
First, calculate the amount of NaCl needed. Since the solution requires a 5% concentration, this means you need 5 grams of NaCl for every 100 mL of solution. Therefore, for a 250 mL solution, you'll need (5 g/100 mL) x 250 mL = 12.5 grams of NaCl.

Step 2: Glassware and Safety Precautions
For this solution, you will need a 250 mL volumetric flask, a balance, a spatula, and distilled water. Make sure to wear appropriate safety equipment such as gloves and goggles while working with chemicals.

Step 3: Weighing NaCl
Using a balance, weigh out 12.5 grams of NaCl. Avoid touching the solid NaCl with your bare hands to prevent contamination.

Step 4: Dissolving NaCl
Carefully transfer the weighed NaCl into the 250 mL volumetric flask using a spatula. Add a small amount of distilled water to dissolve the solid powder. Swirl or stir gently using a glass stirring rod until the NaCl is completely dissolved.

Step 5: Filling the Volumetric Flask
Once the NaCl has dissolved, carefully add more distilled water to the flask until it reaches the calibration mark on the neck of the flask. It is important to add the water slowly and carefully to ensure accuracy.

Step 6: Mixing and Homogenizing
Tightly close the cap of the volumetric flask and thoroughly mix the solution by inverting it several times. This will help to homogenize the solution and ensure that the NaCl is evenly distributed throughout.

Congratulations! You have now prepared a 250 mL solution of 5% NaCl (w/v) from solid NaCl using good laboratory technique.

Now let's move on to the preparation of 250 mL of 3 M HNO3 from concentrated nitric acid.

To prepare a 250 mL solution of 3 M HNO3 from 15.8 M concentrated nitric acid, follow these steps:

Step 1: Calculation
To calculate the amount of concentrated nitric acid needed, we can use the formula:
C1V1 = C2V2, where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

In this case, C1 is 15.8 M, V1 is the unknown, C2 is 3 M, and V2 is 250 mL. Rearranging the formula, we get: V1 = (C2V2) / C1.

Substituting the values, V1 = (3 M x 250 mL) / 15.8 M ≈ 47.47 mL.

Step 2: Glassware and Safety Precautions
For this solution, you will need a 250 mL volumetric flask, a pipette or burette, a graduated cylinder, a balance, a glass stirring rod, and concentrated nitric acid. Wear gloves, goggles, and work in a fume hood to ensure safety.

Step 3: Measurement
Use a graduated cylinder or a pipette to measure approximately 47.47 mL of the concentrated nitric acid carefully. Pour it into the 250 mL volumetric flask.

Step 4: Filling the Volumetric Flask
Slowly add distilled water to the flask until it reaches the calibration mark on the neck of the flask. Take extra care while adding the water to avoid splashes or spills.

Step 5: Mixing and Homogenizing
Securely close the cap of the volumetric flask and mix the solution thoroughly by swirling it gently. Ensure that the concentrated nitric acid is well-distributed throughout the solution.

Congratulations! You have successfully prepared 250 mL of 3 M HNO3 from concentrated nitric acid using good laboratory technique.