Knowing the MW of salicylic acid (138.12g/mol), design a procedure to make 100mL of a 0.0050M salicylic acid solution.
How many mols do you want? That's mols = M x L = ?
Then mols = grams/molar mass. You know molar mass and mols,solve for grams.
Weigh that many grams salicylic acid, place in a 100 mL volumetric flask, add enough solvent to dissolve it, swirl until dissolved, make to the mark with the solvent, mix thoroughly, stopper.
Thank you DrBob222!
To design a procedure to make a 0.0050M salicylic acid solution in 100mL, you will need to determine the amount of salicylic acid needed.
Step 1: Calculate the moles of salicylic acid needed.
moles = molarity x volume
moles = 0.0050 mol/L x 0.100 L
moles = 0.00050 mol
Step 2: Calculate the mass of salicylic acid needed.
mass = moles x MW
mass = 0.00050 mol x 138.12 g/mol
mass = 0.06906 g
So, to make a 100mL solution with a concentration of 0.0050M salicylic acid, you will need approximately 0.06906 grams of salicylic acid.
Procedure:
1. Using a balance, weigh approximately 0.06906 grams of salicylic acid.
2. Transfer the weighed salicylic acid to a clean, dry container (such as a beaker).
3. Add a small amount of distilled water to the container, and gently stir until the salicylic acid dissolves completely.
4. Once the salicylic acid has dissolved, transfer the solution to a 100mL volumetric flask.
5. Rinse the container with distilled water and add the rinse to the volumetric flask to ensure all the salicylic acid is transferred.
6. Fill the volumetric flask up to the 100mL mark with distilled water, carefully ensuring it reaches precisely the mark.
7. Stopper the flask and invert it several times to mix the solution thoroughly.
You have now prepared a 100mL solution of 0.0050M salicylic acid.