Final answer:
The wavelength of maximum absorbance for aqueous cobalt(II) can be found by identifying the highest peak in the UV-Vis spectrum above 230 nm. This peak indicates the wavelength at which the compound absorbs the most light, also known as Amax.
Step-by-step explanation:
To determine the wavelength of maximum absorbance for aqueous cobalt(II), we need to look at the UV-Vis spectrum of the compound. The wavelength of maximal light absorbance (Amax) is the peak where the compound absorbs the most light. For example, NAD* has an Amax of 260 nm. We can then use the absorbance (A), measured at Amax, and the molar absorptivity (ε) to calculate the concentration of the sample using Beer-Lambert's Law, given the path length is usually 1 cm.
In the case of aquous cobalt(II), without specific data provided, we cannot specify the exact wavelength; however, we can say that you should look for the highest peak in the UV-Vis spectrum that is above 230 nm - this will represent the Amax. If spectral data is provided, it will show a peak similar to the one described for NAD* at 260 nm. The specific value of the wavelength of maximum absorbance will usually be observed as a clear peak on the spectrum.