Assume that 50ml of 0.01M edta solution were added to 25ml of co solution and the excess edta required 20ml of 0.005M mg solution. Calculate ppm co+ present.
The answer 942ppm
Bob helps me
To calculate the ppm of CO+ present, we need to understand the reaction that takes place between CO+ and EDTA (Ethylenediaminetetraacetic acid).
In this reaction, CO+ from the CO solution reacts with EDTA to form a complex. The excess EDTA is then titrated with Mg solution until the reaction is complete.
First, let's calculate the number of moles of EDTA that react with the CO+ in the solution. We can use the formula:
n(EDTA) = C(EDTA) × V(EDTA)
where:
- n(EDTA) is the number of moles of EDTA used
- C(EDTA) is the concentration of the EDTA solution (in moles per liter)
- V(EDTA) is the volume of the EDTA solution used (in liters)
Using the given values:
- C(EDTA) = 0.01 M
- V(EDTA) = 50 ml = 0.05 L
n(EDTA) = 0.01 M × 0.05 L = 0.0005 moles
Now, let's calculate the number of moles of Mg required to titrate the excess EDTA. We can again use the formula:
n(Mg) = C(Mg) × V(Mg)
where:
- n(Mg) is the number of moles of Mg used
- C(Mg) is the concentration of the Mg solution (in moles per liter)
- V(Mg) is the volume of the Mg solution used (in liters)
Using the given values:
- C(Mg) = 0.005 M
- V(Mg) = 20 ml = 0.02 L
n(Mg) = 0.005 M × 0.02 L = 0.0001 moles
Now, we need to calculate the number of moles of CO+ present in the solution. Since EDTA and CO+ react in a 1:1 ratio, the number of moles of CO+ is equal to the number of moles of EDTA used.
n(CO+) = 0.0005 moles
To calculate the ppm of CO+ present, we need to consider the volume of the CO solution. Let's assume it is 25 ml = 0.025 L.
To convert moles to ppm, we can use the formula:
ppm = (n / V) × 10^6
where:
- ppm is parts per million
- n is the number of moles
- V is the volume (in liters)
ppm(CO+) = (0.0005 moles / 0.025 L) × 10^6 = 20,000 ppm
However, this calculation gives us the ppm of CO+ in the original CO solution. To find the ppm of CO+ in the final solution, we need to consider the dilution caused by adding the EDTA solution.
Let's assume the final volume of the solution is the sum of the volumes of the CO and EDTA solutions, which is 0.025 L + 0.05 L = 0.075 L.
To find the ppm of CO+ in the final solution, we can use the formula:
ppm(final) = (ppm(initial) × V(initial)) / V(final)
where:
- ppm(final) is the ppm of CO+ in the final solution
- ppm(initial) is the ppm of CO+ in the CO solution
- V(initial) is the volume of the CO solution (in liters)
- V(final) is the final volume of the solution (in liters)
ppm(final) = (20,000 ppm × 0.025 L) / 0.075 L = 6,666.67 ppm
Therefore, the ppm of CO+ in the final solution is approximately 6,666.67 ppm or 6.7 x 10^3 ppm.
It seems the provided answer of 942 ppm is incorrect based on the given information and calculations.