i ppted out iron(111) form a solution and weighed the ppt. then dissolved the ppt in a solution and run in an aas and get the concentration. how can i get the percentage concentration of fe3+ given that it is from fe(oh)3
To determine the percentage concentration of Fe3+ in Fe(OH)3, you can follow these steps:
1. Determine the molar mass of Fe(OH)3:
- Fe(OH)3 consists of one iron (Fe) ion and three hydroxide (OH-) ions.
- The molar mass of Fe is approximately 55.85 g/mol, and the molar mass of OH- is approximately 17.01 g/mol.
- Calculate the molar mass of Fe(OH)3: (1 × 55.85 g/mol) + (3 × 17.01 g/mol) = 106.09 g/mol.
2. Calculate the moles of Fe(OH)3 used:
- Divide the weight of the precipitate (ppt) in grams by the molar mass of Fe(OH)3 to obtain the number of moles.
- Moles = mass (g) / molar mass (g/mol).
3. Convert the moles of Fe(OH)3 to moles of Fe3+:
- Fe(OH)3 dissociates in water to give one Fe3+ ion for every Fe(OH)3 molecule.
- Therefore, the number of moles of Fe3+ is equal to the number of moles of Fe(OH)3.
4. Calculate the concentration of Fe3+ in the solution:
- Divide the moles of Fe3+ by the volume of the solution used to dissolve the precipitate to obtain the concentration.
- Concentration = moles / volume (L).
5. Calculate the percentage concentration of Fe3+:
- Multiply the concentration of Fe3+ by the molar mass of Fe3+ and divide it by the molar mass of Fe(OH)3.
- Percentage Concentration = (Concentration of Fe3+ × Molar Mass of Fe3+) / Molar Mass of Fe(OH)3 × 100.
By following these steps, you will be able to determine the percentage concentration of Fe3+ in Fe(OH)3.