Question

Classify the following measurements as either classical or instrumental analytical techniques, qualitative or quantitative

A. An assay for nickel in a sample of iron ore using atomic absorption spectroscopy.
B. A determination of alcohol in blood by titration measurements.
C. The quantitation of red food dye in a sample of Cheetos by UV-Vis spectrophotometry.
D. The identification of a pharmaceutical by derivitization with 2,4-dinitrotoluene followed by measurement of its melting point.
E. The identification of hydrogen sulfide production during a reaction of acid and iron based on its obnoxious smell
F. A biochemical assay to measure the amount of a particular protein in a sample based using a liquid chromatographic system.

Answer 1

1) An assay for nickel in a sample of iron ore using atomic absorption spectroscopy- quantitative, instrumental

2) A determination of alcohol in blood by titration measurements- quantitative, classical

3) The quantitation of red food dye in a sample of Cheetos by UV-Vis spectrophotometry - quantitative, instrumental

4) The identification of a pharmaceutical by derivitization with 2,4-dinitrotoluene followed by measurement of its melting point - qualitative, classical

5) The identification of hydrogen sulfide production during a reaction of acid and iron based on its obnoxious smell - qualitative, classical

6) A biochemical assay to measure the amount of a particular protein in a sample based using a liquid chromatographic system - quantitative, instrumental

Step-by-step explanation:

A quantitative analysis seeks to determine the amount of substance present while a qualitative analysis seeks to determine the kind of substance present in a sample.

Analytical methods in which the responsibility of detection has been removed from human beings and placed on automated instruments are called instrumental methods of analysis such as HPLC, AAS, spectrophotometry, etc.

Classical methods of analysis place the responsibility of detection on human beings.