Question

The absorbance of solution having 20% transmittance is

Answer 1

Given,

The transmittance of any solution having 20%.

To Find,

The absorbance of the given solution.

Solution,

We will solve this numerical problem using the below method.

To compute absorbance from transmittance( percent) this formula can be used :

Absorbance = 2 – log(%T).

In spectrophotometry, absorbance and transmittance are the measures.

The fraction of incident light that is transmitted or n other words, the amount of light that "successfully" travels through a substance and emerges from the other side is known as transmittance (T).

On the other hand, Absorbance (A) is the inverse of transmittance and indicates how much light was absorbed by the sample.

If T = 0.25, then %T = 25%.

Here %T =20%.

So, the absorbance = 2 – log(20).

=2- 1.301

=0.699.

Hence, the absorbance of the solution having 20% transmittance is 0.699 .

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Answer 2

1. The measurements in spectrophotometry are absorbance and transmittance.
2. Transmittance$(T)$ is defined as the fraction of incident light that is transmitted, or the amount of light that successfully travels through a substance and emerges on the other side.
3. Absorbance $(A)$, is the inverse of transmittance and indicates how much light was absorbed by the sample.

Step 1: Given data

transmittance of given solution, $T=20\%$

absorbance of given solution$=?$

Step 2: Using the formula

$A= 2-log(T\%)$

Step 3: Calculating the absorbance of the given solution

As per the given data,

$T\% = 20\%$

Thus, the absorbance is calculated using,

$A=2-log(20)=2-1.301=0.699$

Hence, the absorbance of the solution having $20\%$ transmittance is $0.699$ .

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