Here is procedure picture of lab, appareciate answers in a few sentences! Questi

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Here is procedure picture of lab, appareciate answers in a few sentences!

Questions (Provide answers in the Laboratory Notebook) (5) Why is ion suppression an essential instrumental aspect of this experiment, especially in terms of analyte detection? (6) Why would one use gradient elution in ion chromatography? (7) Why is fluoride detected in your tapwater samples? An internet search may be helpful. (8) Were there any apparent differences between Bloomington and Normal water samples? (9) Using your unknown determinations and assuming that the F and CI comes from dissolved KF and KCI, calculate the ppm of K' in your unknown.

Explanation / Answer

Ans.

1) Ion-suppression has the advantage of simultaneously separating ionizable and non-ionizable compounds because of Ion-suppression is a reversed phase technique suitable for ionisable compounds.

2) In gradient elution, the eluent strength is increased during the separation by changing the composition of the mobile phase. As a result, the analysis time is reduced and the quality of the separation is improved as well as the detection limit.

3) Fluoride is naturally present in the original source of the water. That's why you have seen a fluoride detection.

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