How you can prepare 100mmolL of NaCl?

A clean, dry container to store your stock solution, such as a glass bottle with a tight-fitting cap.

Molecular weight of NaCl = 58.44 g/mole.

1. Calculate the amount of NaCl needed.

To prepare 100 mmol/L of NaCl, you need to calculate the number of grams of NaCl required. The formula to calculate this is:

Molarity (mol/L) = moles of solute / volume of solution (L)

In this case, we want to make a 100 mmol/L solution, so:

100 mmol/L = moles of NaCl / volume of solution (L)

To find the moles of NaCl, rearrange the formula:

moles of NaCl = Molarity (mol/L) x volume of solution (L)

moles of NaCl = 0.1 mol/L x 1 L

moles of NaCl = 0.1 mol

2. Convert moles of NaCl to grams.

Once you know the number of moles of NaCl needed, you can convert it to grams using the molecular weight of NaCl (58.44 g/mole):

grams of NaCl = moles of NaCl x molecular weight

grams of NaCl = 0.1 mol x 58.44 g/mole

grams of NaCl = 5.844 g

3. Prepare the solution.

Weigh 5.844 grams of NaCl using a calibrated balance and transfer it to your container.

Add distilled water to the container up to the 1 liter mark.

Stir the solution thoroughly until the NaCl is dissolved completely.

Your 100 mmol/L NaCl stock solution is now ready to use.

Note: When preparing a stock solution, it's important to use high-quality water (such as distilled water) to ensure the accuracy of the concentration. Additionally, properly labeling the container with the stock solution's name and concentration is essential for safety and traceability.