a solution is prepared by dissolving 3.7500grams iron(III) oxalate in enough water to make 125.00mL of solution.
1. what is the molar concentration of iron(III) oxalate in this solution?
2. what is the molar concentration of oxalate ions in this solution?
a. figure the mole mass of IronIII oxalate.
M=mass/molmass*1/.125
b. Look at the formual for iron III oxalate. Are there three oxalate ions for each molecule of IronIII oxalate? So multiply a. above by 3.
To find the molar concentration of iron(III) oxalate and oxalate ions in the solution, we first need to calculate the number of moles of the solute in the solution.
1. Molar concentration of iron(III) oxalate:
The molar concentration (M) is calculated by dividing the number of moles of solute by the volume of the solution in liters.
To find the number of moles of iron(III) oxalate:
- Convert the mass of iron(III) oxalate to moles: divide the given mass (3.7500 grams) by the molar mass of iron(III) oxalate.
- The molar mass of iron(III) oxalate (Fe(C2O4)3) can be calculated by summing the atomic masses of its constituents:
- Iron (Fe): 55.845 g/mol
- Carbon (C): 12.011 g/mol
- Oxygen (O): 16.00 g/mol
Molar mass of Fe(C2O4)3 = (55.845 g/mol) + 3 * [(12.011 g/mol) + 4 * (16.00 g/mol)]
Now, divide the given mass by the molar mass to get the number of moles:
Number of moles = given mass / molar mass
Substitute the given values:
Number of moles = 3.7500 g / molar mass of Fe(C2O4)3
2. Molar concentration of oxalate ions:
Since there are three oxalate ions (C2O4^2-) in one formula unit of iron(III) oxalate, we need to multiply the number of moles of iron(III) oxalate by 3 to find the number of moles of oxalate ions.
Now, calculate the molar concentration of iron(III) oxalate and oxalate ions:
Molar concentration = Number of moles / Volume of solution in liters
Substitute the given values:
Molar concentration of iron(III) oxalate = (Number of moles of iron(III) oxalate) / (volume of solution in liters)
Molar concentration of oxalate ions = (Number of moles of oxalate ions) / (volume of solution in liters)
For both calculations, we still need the volume of the solution in liters. The given volume is 125.00 mL. To convert it to liters, divide it by 1000:
Volume of solution in liters = 125.00 mL / 1000
Finally, substitute these values and solve the equations to find the molar concentrations.