How would one be able to identify the lambda max of Cr(III) at a concentration less than 70ppm from a graph? I couldn't post the graph, but I don't understand how one would be able to do this?
The graph had the Chromium Absorbance Spectra of 70ppm for Cr(VI) and Cr(III). Cr(VI) intersects the curve for Cr(III) at one point.
It is possible to detect Cr(III) in the presence of Cr(VI) using a lambda max of 560-580nm.
Cr(VI) exhibits 2 absorption bands, one with lambda max of 348nm and a 2nd broader band with lambda max of 435nm.
Cr(III) has 2 absorption bands one with lambda max of 405nm and one with lambda max of 576nm.
To identify the lambda max of Cr(III) at a concentration less than 70ppm from a graph, you can follow these steps:
1. Take a closer look at the graph that shows the Chromium Absorbance Spectra of 70ppm for Cr(VI) and Cr(III). Identify the absorption curves for Cr(VI) and Cr(III) on the graph.
2. Since Cr(VI) intersects the curve for Cr(III) at one point, it suggests that the absorption wavelengths of Cr(VI) and Cr(III) are different. The point of intersection is where the absorption values of both species are equal.
3. Look for the absorption bands on the graph. Cr(VI) exhibits two absorption bands, one with a lambda max of 348nm and a broader band with a lambda max of 435nm. These absorption bands represent the wavelengths at which Cr(VI) absorbs light most strongly.
4. Similarly, Cr(III) also has two absorption bands. One with a lambda max of 405nm and another with a lambda max of 576nm. These wavelengths represent the specific points at which Cr(III) absorbs light most strongly.
5. Identify the lambda max value of Cr(III) by locating the peak in the absorption curve of Cr(III) on the graph. Based on the provided information, the approximate range for the lambda max of Cr(III) is 560-580nm. Therefore, find the peak within this range on the graph.
6. Once you have located the peak for Cr(III), note down the corresponding wavelength (lambda max). This value represents the lambda max of Cr(III) at a concentration less than 70ppm from the given graph.
Please keep in mind that without the actual graph, it is not possible to provide an exact lambda max value. The steps described above can guide you on how to identify the lambda max based on the information you provided.