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Question Video: Identifying the Statement Which Does Not Describe Qualitative Analysis Chemistry

Which of the following is not an example of qualitative chemical analysis? [A] Determining the concentration of a compound in solution [B] Identifying the cationic groups in a compound [C] Identifying the anionic groups in a compound [D] Identifying the functional group in a molecule [E] Determining the elemental composition of a molecule

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Video Transcript

Which of the following is not an example of qualitative chemical analysis? (A) Determining the concentration of a compound in solution. (B) Identifying the cationic groups in a compound. (C) Identifying the anionic groups in a compound. (D) Identifying the functional group in a molecule. Or (E) determining the elemental composition of a molecule.

There are two ways to analyze a chemical sample: by qualitative analysis or by quantitative analysis. Qualitative analysis is the identification of substances in a sample, in other words identifying what constituents a sample is composed of, be it elements, ions, or molecules or a mixture of these, whereas quantitative analysis is the determination of the quantity or amount or abundance of a substance, be it elements, ions, molecules in a sample. So qualitative analysis involves finding out the identity of an analyte, while quantitative analysis involves finding out the quantity of the analyte.

The question asks, which of the following is not an example of qualitative chemical analysis? In other words, they are asking us, which answer is an example of quantitative analysis where we measure the quantity of an analyte? There are various ways to measure the amount of an analyte in a sample. We can measure its mass, or we can determine its concentration, or we can express its amount in terms of moles or as a percentage in relative abundance.

So determining the concentration of a compound in solution is an example of quantitative analysis. Identifying cationic groups is a qualitative analysis. Identifying anionic groups is also a qualitative process. Identifying which functional groups are present is not a measurement of the amount of analyte, and so we can rule this answer option out too. And lastly, determining the elemental composition is all about determining which elements are present and not the amount of each element.

Finally, which of the following is not an example of qualitative chemical analysis? The answer is (A) determining the concentration of a compound in solution.

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