### Absorbance Measurements#### Optimal RangeAbsorbance measurements in the range of \( A = 0.3 - 2 \) are considered the most accurate.#### Inaccuracy in Absorbance Measurements**Why are absorbance measurements of 0.05 and 2.5 considered inaccurate?**1. **High Absorbance (A = 2.5):** - The signal difference between the sample and the reference is too small for an accurate measurement. - The detector is saturated because too much light is reaching the detector.2. **Low Absorbance (A = 0.05):** - The difference in the absorbance of the sample and reference is too small.3. **Transmission at A = 2.5:** - The transmission is too high for an accurate measurement (unchecked). - A sufficient amount of light does not reach the detector for an accurate measurement (unchecked).

The amount of light that a sample absorbs is measured by its absorbance. It is also referred to as decadic absorbance, optical density, and extinction. Spectroscopy is used to measure the property, especially for quantitative analysis. The term "absorbance units," which are dimensionless and carry the prefix AU, is used to refer to typical absorbance units.According to the given question, we have 5 statements and we have to select only the correct statements regarding the given statement. Statement 1 - Incorrect If the absorbance is too high (A = 2.5), the signal difference between the sample and the reference is too small for an accurate measurement is incorrect because the difference between the sample and the reference will be large. Statement 2 - Incorrect At A = 2.5, the transmission is too high for an accurate measurement and is incorrect because the transmission will not high for an accurate measurement.Statement 3 - Correct The difference in the absorbance of the sample and reference is too small at A = 0.05 is a correct statement because the reference has a value of A =0 due to which the difference will be too small at A =0.05 Statement 4 - Incorrect At A = 2.5, the detector is saturated because too much light is reaching the detector is incorrect because the detector will not be saturated. Statement 5 - Correct At A = 2.5, a sufficient amount of light does not reach the detector for an accurate measurement is a true statement because the light reaching to the detector will be less when the absorbance is too high.The correct statement are 3 and 5 which are, Statement 3- The difference in the absorbance of the sample and reference is too small at A = 0.05. Statement 5- At A = 2.5, a sufficient amount of light does not reach the detector for an accurate measurement.

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Chemistry

Absorbance measurements in the range of A = 0.32 are considered the most accurate. Why are absorbance measurements of 0.05 and 2.5 considered inaccurate? If the absorbance is too high (A = 2.5), the signal difference between the sample and the reference is too small for an accurate measurement. At A = 2.5, the transmission is too high for an accurate measurement. The difference in the absorbance of the sample and reference is too small at A = 0.05. At A = 2.5, the detector is saturated because too much light is reaching the detector. At A = 2.5, a sufficient amount of light does not reach the detector for an accurate measurement.

Absorbance measurements in the range of A = 0.32 are considered the most accurate. Why are absorbance measurements of 0.05 and 2.5 considered inaccurate? If the absorbance is too high (A = 2.5), the signal difference between the sample and the reference is too small for an accurate measurement. At A = 2.5, the transmission is too high for an accurate measurement. The difference in the absorbance of the sample and reference is too small at A = 0.05. At A = 2.5, the detector is saturated because too much light is reaching the detector. At A = 2.5, a sufficient amount of light does not reach the detector for an accurate measurement.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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