Question

1.
A 100ppm standard solution of Fe3+
after developing colour with exess ammonium Thiocynate solution
shows a transmitiane
of 0.4 at 622 nm while an unknown
solution of Fe3+ after
developing colour shows transmittance of 0.6 at the same wavelength - Calculate the concentration
of Fe3+ solution.
​

Answer 1

Answer: The concentration of Fe+3 in solution is :- 150ppm

Explanation:

1.

A 100ppm standard solution of Fe3+

after developing colour with excess ammonium Thiocynate solution

shows a transmitiane

of 0.4 at 622 nm while an unknown

solution of Fe3+ after

developing colour shows transmittance of 0.6 at the same wavelength - Calculate the concentration

of Fe3+ solution:-

Here the concentration of the Fe+3 is proportional to the transmittance measured by the device and that is given in the question:-

As two cases are there we calculate for both the parts and get the values and just find the final answer using ratio and proportions:-

So now:-

100pm to 0.4 at 622nm and then

at the same wavelength the equation:-

100pm to 0.4 then the equation comes down to

xppm to 0.6 at the same wavelength so using ratio and proportion:-

25ppm to 0.1 so

150ppm to 0.6.

Answer:-The concentration of Fe+3 in solution is :- 150ppm.

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Answer 2

The concentration of Fe⁺³ in solution is 150ppm.

Given,

Solution concentration (c₁)=100ppm

Transmittance(T₁)= 0.4

Wavelength= 622nm.

Transmittance of another solution(T₂)= 0.6

To find,

The concentration of Fe3+ solution(c₂).

Solution,

According to Beer Lambert's law, absorbance is given by:

A =εcl

(Where ε is extinction coefficient, c is the concentration and l is the path length.)

A = log(1/T)

Now,

We can simply solve this numerical problem, using ratios and proportion method:

100 ppm gives transmittance of 0.4 at 622nm.

25 ppm will give transmittance of 0.1

∴ 0.6 transmittance will be given by= 150ppm solution.

Hence, the concentration of Fe⁺³ in solution is 150ppm.

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