Mixing the chelating reagent B with Ni(II) forms the highly colored NiB 2 2+ , whose solutions obey.

Mixing the chelating reagent B with Ni(II) forms the highly
colored NiB22+, whose solutions obey Beer’s law at 395
nm over a wide range. Provided the analytical concentration of the chelating
reagent exceeds that of Ni(II) by a factor of 5 (or more), the cation exists,
within the limits of observation, entirely in the form of the complex. Use the
accompanying data to evaluate the formation constant Kf for the
process

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