Aspirin tablet, mass of tablet= 0.4149 g concentration of iron III salicylate complex = 3.997E-4, What is the concentration of ASA in the original solution? What is the mass of ASA in the original solution?
The procedure was as follows: accurately weigh by difference a tablet and transfer it into a 125ml erlnemyer flask, add 20 ml of 0.5 M NaOH and gently heat the mixture to boiling, Transfer the solution to a 100 ml volumetric flask and dilute the solution with water to the 100ml mark, pipet 2ml of the solution into a 100 ml volumetric flask and dilute to 100ml mark with 0.02 M iron III chloride Solution.
To determine the concentration of ASA (Acetylsalicylic acid) in the original solution, we need to follow the steps described in the procedure. Here's how we can calculate it:
Step 1: Calculate the moles of iron III salicylate complex
First, we need to convert the mass of the aspirin tablet into moles. Let's assume the molar mass of ASA is 180.16 g/mol.
Number of moles of ASA = mass of tablet / molar mass of ASA
Number of moles of ASA = 0.4149 g / 180.16 g/mol
Step 2: Dilution calculations
We know that 2 mL of the solution from the volumetric flask (100 mL) was pipetted into another 100 mL volumetric flask and diluted with 0.02 M iron III chloride solution. Let's calculate the final concentration of the iron III salicylate complex.
Concentration of iron III salicylate complex = (Volume of solution pipetted / Final volume of solution) * Concentration of iron III chloride solution
Concentration of iron III salicylate complex = (2 mL / 100 mL) * 0.02 M
Step 3: Calculate the original concentration of ASA
Since the stoichiometric ratio between ASA and the iron III salicylate complex is 1:1, the concentration of ASA in the original sample will be the same as the concentration of the iron III salicylate complex.
Concentration of ASA in the original solution = Concentration of iron III salicylate complex
Step 4: Calculate the mass of ASA in the original solution
To calculate the mass of ASA in the original solution, we need the concentration of ASA and the volume of the original solution.
Mass of ASA = Concentration of ASA * Volume of the original solution
Please provide the volume of the original solution for a more accurate calculation.