An EDTA solution is standardized against a solution of primary standard CaCO3 (0.5622 g dissolve in 1000 ml of solution) and titrating aliquots of it with the EDTA. If a 25.00 ml aliquot required 21.88 ml of the EDTA, what is the concentration of the EDTA?
mols CaCO3 = grams/molar mass
M CaCO3 = mols/L
mol = 0.5622/100 = 0.005622 and that is in 1L; therefore M = 0.005622M.
Then I would use
MEDTA x 21.88mL EDTA = MCaCO3 x 25.00 mL CaCO3. Solve for MEDTA
first get for the moles of CaCO3
mols CaCO3= 0.5662g*(1mol CaCO3/100gCaCO3)
Molarity of CaCO3= mols CaCO3/L of solution
=0.005622mols/1L
M EDTA= [(molarity CaCO3)(mL aliquot)]/
mL of EDTA
M EDTA= [(0.005622)(25)]/21.88
= 0.00642 M
Why did the EDTA solution go to therapy?
Because it had trouble finding its concentration and needed someone to titrate its problems away!
Now, let's calculate the concentration of the EDTA. We know that 0.5622 g of CaCO3 was dissolved in 1000 ml of solution. This means that the number of moles of CaCO3 in the solution is given by:
moles of CaCO3 = mass of CaCO3 / molar mass of CaCO3
To find the molar mass of CaCO3, we add the atomic masses of calcium (Ca), carbon (C), and three oxygen (O) atoms:
molar mass of CaCO3 = atomic mass of Ca + atomic mass of C + (3 x atomic mass of O)
Next, we need to find the number of moles of EDTA that reacted with the CaCO3 in the 25.00 ml aliquot. Since EDTA and CaCO3 have a 1:1 stoichiometric ratio, the number of moles of EDTA can be calculated using the equation:
moles of EDTA = (volume of EDTA used / 1000) x (concentration of EDTA)
Now we can calculate the concentration of EDTA:
concentration of EDTA = moles of EDTA / volume of EDTA used
Plug in the given values:
moles of CaCO3 = 0.5622 g / (molar mass of CaCO3)
moles of EDTA = (21.88 ml / 1000) x (concentration of EDTA)
concentration of EDTA = moles of EDTA / 21.88 ml
Unfortunately, we are missing the value for the molar mass of CaCO3 and the concentration of EDTA. Once those values are provided, we can calculate the concentration of the EDTA.
To determine the concentration of the EDTA solution, we can use the equation:
M1V1 = M2V2
Where:
M1 = concentration of CaCO3 solution
V1 = volume of CaCO3 solution (in this case, the aliquot volume)
M2 = concentration of EDTA solution
V2 = volume of EDTA solution used in the titration
First, let's calculate the concentration of CaCO3 solution:
M1 = (mass of CaCO3 / volume of CaCO3 solution)
M1 = (0.5622 g / 1000 mL)
M1 = 0.0005622 g/mL
Next, we substitute the given values into the equation:
(0.0005622 g/mL) * (25.00 mL) = M2 * (21.88 mL)
Solving for M2:
M2 = (0.0005622 g/mL * 25.00 mL) / 21.88 mL
M2 = 0.00064301 g/mL
Therefore, the concentration of the EDTA solution is approximately 0.00064301 g/mL.
To find the concentration of the EDTA solution, we need to use the following formula:
Concentration of EDTA = (moles of CaCO3) / (volume of EDTA solution used)
Let's calculate the moles of CaCO3 first:
Moles of CaCO3 = (mass of CaCO3) / (molar mass of CaCO3)
The molar mass of CaCO3 is calculated by adding up the atomic masses of each element in the compound:
Molar mass of CaCO3 = (atomic mass of Ca) + (atomic mass of C) + 3*(atomic mass of O)
Now, we can substitute the given values into the formula:
Moles of CaCO3 = (0.5622 g) / (molar mass of CaCO3)
To calculate the molar mass of CaCO3, we need the atomic masses of Ca and C:
Atomic mass of Ca = 40.08 g/mol
Atomic mass of C = 12.01 g/mol
Atomic mass of O = 16.00 g/mol
Using these values, we can calculate the molar mass of CaCO3:
Molar mass of CaCO3 = (40.08 g/mol) + (12.01 g/mol) + 3*(16.00 g/mol)
Next, we can calculate the moles of CaCO3:
Moles of CaCO3 = (0.5622 g) / (molar mass of CaCO3)
Now that we have the moles of CaCO3, we can calculate the concentration of the EDTA solution:
Concentration of EDTA = (moles of CaCO3) / (volume of EDTA solution used)
Given that a 25.00 ml aliquot of CaCO3 required 21.88 ml of the EDTA solution, we substitute these values into the formula:
Concentration of EDTA = (moles of CaCO3) / (21.88 ml)
By following these steps and performing the necessary calculations, you can find the concentration of the EDTA solution.