Zinc is to be used as an internal standard for the polarographic analysis of thallium. A standard solution containing twice the concentration of zinc as thallium has diffusion currents of 1.89 microAmps for thallium and 3.5 microAmps for zinc. A 10.0g sample of an alloy containing thallium but no zinc is dissolved to make 500ml of solution. To 25ml of this solution is added 25ml of a 0.001M zinc solution. The diffusion currents are then measure and found to be 18.2 microAmps for Tl and 14.5 microAmps for Zn. Calculate percentate of thallium in d alloy

Why did the thallium go to therapy with zinc? Because it needed someone to talk to about its diffusion currents!

But let me try to help you solve your problem. To find the percentage of thallium in the alloy, we need to use the concentrations and diffusion currents.

First, let's calculate the concentration of thallium in the 25ml solution:
Concentration of Tl = (Diffusion Current of Tl / Diffusion Current of Zn) * Concentration of Zn
= (18.2 microAmps / 14.5 microAmps) * 0.001M
= 0.001273 M

Next, let's calculate the concentration of thallium in the alloy:
Concentration of Tl in the alloy = Concentration of Tl in the 25ml solution * Dilution factor
= 0.001273 M * (500ml / 25ml)
= 0.02546 M

Finally, let's calculate the percentage of thallium in the alloy:
Percentage of Tl = (Concentration of Tl in the alloy / Total concentration of the alloy) * 100
= (0.02546 M / 0.02546 M) * 100
= 100%

So, the percentage of thallium in the alloy is 100%. It seems like the alloy is pure thallium. Maybe they should rename it as "Thalliumium"!

I hope my calculation brought a smile to your face and helped you with your task. Let me know if you need any further assistance!

To calculate the percentage of thallium in the alloy, we need to compare the diffusion currents of thallium in the standard solution and the sample solution.

Let's start by calculating the concentration of thallium in the standard solution:

Given: Diffusion current of thallium in the standard solution = 1.89 μA
Diffusion current of zinc in the standard solution = 3.5 μA
Concentration of zinc in the standard solution = twice the concentration of thallium

Let the concentration of thallium in the standard solution be x M.
Then, the concentration of zinc in the standard solution = 2x M.

Now, we can use Faraday's law of electrolysis to relate the diffusion currents to the concentrations:

Diffusion current (μA) = (2.303 * 10^5 * Concentration (M)) / square root of (time (sec))

Let's calculate the concentration of thallium in the standard solution:

1.89 μA = (2.303 * 10^5 * x) / square root of (time (sec))

Simplifying the equation, we get:

1.89 = (2.303 * 10^5 * x) / square root of (time (sec))

Similarly, we can calculate the concentration of zinc in the standard solution:

3.5 μA = (2.303 * 10^5 * 2x) / square root of (time (sec))

Simplifying the equation, we get:

3.5 = (2.303 * 10^5 * 2x) / square root of (time (sec))

Now, let's calculate the concentration of thallium in the sample solution:

Given:
Volume of sample solution = 25 ml
Volume of zinc solution added = 25 ml
Concentration of the zinc solution = 0.001 M

Using the formula:
Concentration1 * Volume1 = Concentration2 * Volume2

Concentration of the thallium in the sample solution * 25 ml = 0.001 M * 25 ml

Concentration of thallium in the sample solution = 0.001 M

Finally, let's calculate the percentage of thallium in the alloy:

Given:
Mass of the alloy = 10.0 g
Volume of the solution made = 500 ml
Volume of the sample solution used = 25 ml

Concentration of thallium in the sample solution = 0.001 M
Mass of thallium in the sample solution = (Concentration * Volume * Molar mass of thallium)

Now, let's calculate the mass of thallium in the alloy:

Mass of thallium = (mass of thallium in the sample solution) * (Volume of the solution made / volume of the sample solution used)

Percentage of thallium in the alloy = (Mass of thallium / Mass of the alloy) * 100

Using the given values in the calculations, you should be able to determine the percentage of thallium in the alloy.

To calculate the percentage of thallium in the alloy, we need to compare the diffusion currents of thallium and zinc in the standard solution to the diffusion currents in the alloy solution.

Step 1: Calculate the concentration of thallium in the standard and alloy solutions.

In the standard solution, the concentration of zinc is twice that of thallium. Let's assume the concentration of thallium in the standard solution is C Tl. Therefore, the concentration of zinc in the standard solution is 2C Tl.

In the alloy solution, we dissolve a 10.0g sample of the alloy to make a 500ml solution. This means the concentration of thallium in the alloy solution is:

C Tl (in M) = (mass of thallium in alloy / molar mass of thallium) / volume of solution
= (10.0g / molar mass of thallium) / 0.5L

Step 2: Calculate the percentage of thallium in the alloy.

To calculate the percentage of thallium in the alloy, we will use the ratio of the diffusion currents in the alloy solution to those in the standard solution.

Let's assume the percentage of thallium in the alloy is P Tl.

P Tl = (Diffusion current of thallium in alloy / Diffusion current of thallium in standard) * (C Tl / 0.001M) * 100

Given:
Diffusion current of thallium in alloy = 18.2 microAmps
Diffusion current of thallium in standard = 1.89 microAmps
C Tl = (10.0g / molar mass of thallium) / 0.5L

Finally, substitute all the values into the equation to get the percentage of thallium in the alloy.