How do you prepare 500mL of a 2.5M solution of NaOH from the solid compound?
To prepare a 500mL solution of NaOH with a concentration of 2.5M, you will need to follow these steps:
Step 1: Calculate the amount of NaOH needed.
The formula to calculate the amount of solute needed is:
Mass (g) = Molarity (mol/L) x Volume (L) x Molecular Weight (g/mol)
In this case, you want to prepare a 500mL solution with a concentration of 2.5M. The molecular weight of NaOH (sodium hydroxide) is 40.0 g/mol.
Mass = 2.5 mol/L x 0.5 L x 40.0 g/mol
Mass = 50g
So, you will need 50 grams of NaOH.
Step 2: Measure and add the correct amount of NaOH.
Using a balance, measure and weigh 50 grams of solid NaOH. Make sure to handle it with care as it is a caustic substance. Use appropriate safety measures such as gloves and goggles.
Step 3: Prepare the solution.
Add the measured amount of NaOH (50 grams) to a clean, dry container capable of holding at least 500mL.
Step 4: Add water and dissolve.
Add enough distilled water to the container to bring the total volume to 500mL, ensuring all of the NaOH dissolves completely.
Step 5: Mix and store.
Stir the mixture gently until the NaOH is fully dissolved. Once fully dissolved, the 2.5M NaOH solution is ready to use. Make sure to label the container with the concentration and contents.
Remember to always follow proper safety procedures when working with chemicals, such as wearing appropriate protective equipment and working in a well-ventilated area.