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Study on the Relationship between Absorbance of the Colored Substance and Color Reagent Concentration in Fe~(3+)-SCN~-

Tao Hu

Abstract

Based on the discussion about color reagent dosage of spectrophotometry in many analytical textbooks and inorganic and analytical chemistry textbooks, Fe3+-SCN- system was studied. The experimental results showed that when Fe3+ concentration and other conditions were fixed and SCN- color reagent concentration was lower, [Fe(SCN)6]3- absorbance increased with the SCN- concentration increased. With the SCN- concentration amplified, [Fe(SCN)6]3- absorbance decreased after longish time when SCN- color reagent concentration was higher.

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Key concepts: Reagent, Absorbance, Chemistry, Colored, Spectrophotometry, Color reaction, Chromatography, Inorganic chemistry