Question

explain why absorbance values not %T values are usually plotted?

Answer 1

The absorbance values are usually plotted not % transmittance because-

1. Absorbance is a logarithmic scale. This can detect weak signals to very strong signals.

2. Absorbance is good in quantitative analysis and transmittance is good in qualitative analysis.

3. Absorbance is directly proportional to concentration where transmittance is not proportional to concentration.

4. For a standard peak, absorbance is preferred.

5. Absorbance (a logarithmic value which is a positive function) provides variation of the molar extinction coefficient as a function of wavelength.

6. The % of error is also low in absorbance rather than in transmittance.

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