Round 7: Tossup 2

By observing a change in this property, Nessler’s reagent can detect minute amounts of ammonia. This property is compared using Nessler cylinders during a namesake “analysis” that can also use simpler analogues of spectrophotometers to measure this non-absorbance property using Beer’s law. Ninhydrin undergoes a change in this property (-5[1])to detect (*) fingerprints. A change in this property for compounds such as phenol•phthalein (10[1])(“fih-nawl-THAY-leen”) or (10[2])bromo•thymol (10[2])denotes (10[1])the endpoint (10[1])of an acid-base titration. Indicators undergo changes in this property depending on pH. (10[3]-5[2])For 10 points, name this property that can be imparted by pigments. (10[1])■END■ (10[4]0[1])

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