Table of contents

1. Chemical Measurements1h 50m
2. Tools of the Trade1h 17m
3. Experimental Error1h 52m
4 & 5. Statistics, Quality Assurance and Calibration Methods1h 57m
6. Chemical Equilibrium3h 41m
7. Activity and the Systematic Treatment of Equilibrium1h 0m
8. Monoprotic Acid-Base Equilibria1h 53m
9. Polyprotic Acid-Base Equilibria2h 17m
10. Acid-Base Titrations2h 37m
11. EDTA Titrations1h 34m
12. Advanced Topics in Equilibrium1h 16m
13. Fundamentals of Electrochemistry2h 19m
14. Electrodes and Potentiometry41m
15. Redox Titrations1h 14m
16. Electroanalytical Techniques57m
17. Fundamentals of Spectrophotometry50m

1. Chemical Measurements

Chemical Concentrations

Analytical Chemistry

1. Chemical Measurements

Chemical Concentrations

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Multiple Choice

In an experiment monitoring the concentration of a dye during a reaction, which analytical technique is most commonly used to measure the dye concentration?

Gas chromatography

Gravimetric analysis

UV-Visible spectrophotometry

Potentiometry

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Verified step by step guidance

Step 1: Understand the nature of the problem. The question asks for the most commonly used analytical technique to measure the concentration of a dye during a reaction. This requires knowledge of the properties of dyes and the principles of analytical techniques.

Step 2: Recall that dyes typically absorb light in the visible or ultraviolet (UV) region of the electromagnetic spectrum. This property makes UV-Visible spectrophotometry a suitable technique for monitoring dye concentration.

Step 3: Eliminate other options based on their principles: Gas chromatography is used for separating and analyzing volatile compounds, which is not relevant for dye concentration. Gravimetric analysis involves measuring mass, which is not directly applicable to monitoring dye concentration. Potentiometry measures electrical potential, which is unrelated to dye absorption properties.

Step 4: Recognize that UV-Visible spectrophotometry works by measuring the absorbance of light at specific wavelengths, which correlates with the concentration of the dye according to Beer-Lambert law. This makes it the most appropriate technique for this application.

Step 5: Conclude that UV-Visible spectrophotometry is the correct answer because it directly measures the absorbance of the dye, providing a reliable and quantitative method to monitor its concentration during a reaction.