The metal ion indicator xylenol orange (Table 12-3) is yellow atpH6(λmax=439nm).The spectral changes that occur asVO2+is added to the indicator atpH6 are shown here. The mole ratioVO2+/xylenol orange at each point is


Suggest a sequence of chemical reactions to explain the spectral changes, especially the isosbestic points at457 and 528nm.

Absorption spectra for the reaction of xylenol orange withVO2+atpH 6.0

Short Answer

Expert verified

A sequence of chemical reactions to explain the spectral changes, especially the isosbestic points at 457 and528nm is

XVO2++YxylenolorangeXYXY+XX2Y

Step by step solution

01

Define isosbestic point:

During the physical change or chemical change, the total absorbance sample will not change and it will have a specific wavelength or frequency is called isosbestic points.

02

Determine the sequence of chemical reactions from the given isosbestic points:

Hence, whenVO2+is added, corresponding to the traces1-9,the peak at 439nm decreases while one arises at 485nm with isosbestic points at457nm.

Observe the traces 10-16, the peak at 485 nm decreases while one arises at566 nm with isosbestic point at5258nm.

Thus, we write the reaction as,

role="math" localid="1663649615719" XVO2++YxylenolorangeXYXY+XX2Y

Therefore, the sequences of chemical reaction about the spectral changes are,

XVO2++YxylenolorangeXYXY+XX2Y

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