What is the molar absorptivity constant of CuSO4?
The molar absorptivity of CuSO4 at 635 nm is 2.81 M-1cm-1.
How do you calculate the molar absorptivity of a solution?
Using the values you obtained for A, c, and l, plug them into the equation ɛ = A/lc. Multiply l by c and then divide A by the product to solve for molar absorptivity. For example: Using a cuvette with a length of 1 cm, you measured the absorbance of a solution with a concentration of 0.05 mol/L.
What wavelength does copper nitrate absorb?
The results show that the best absorption wavelength is 480 nm and the linear range is 12.5-100 μg…
Where is the absorbance maximum for aqueous CuSO4?
The absorption maximum is around 800 nm, and its molar absorptivity is about 12-13 l/(mol*cm). Example may be found at http://www.nntu.ru/trudy/2013/02/252-256.pdf (Fig. 1, curve 1).
What is molar absorptivity units?
Molar absorptivity is arbitrarily defined for thickness measured in centimeters and concentration in moles/liter. Since A is a pure number, molar absorptivity has the units liters/mole cm.
What does molar absorptivity depend on?
The Molar Absorptivity Constant is specific for every single solution, and at every wavelength. When you are taking an absorbance spectrum, and measuring the absorbance at different wavelengths, this is the only factor that is changing, as the concentration of the solution remains the same, and so does the pathlength.
What color does copper nitrate absorb?
Copper (II) nitrate appears blue to the eye. This is because red light is absorbed and blue light is transmitted (Table 1). The amount of red light absorbed is directly proportional to the concentration of the copper (II) ions in the solution as defined by Beer’s Law.
Why does CuSO4 absorb red light?
CuSO4 has a λmax of about 635 nm (red). It reflects the color blue, so it absorbs mostly red light, the complementary color.
What does Beer’s law calculate?
Beer’s Law is an equation that relates the attenuation of light to properties of a material. The law states that the concentration of a chemical is directly proportional to the absorbance of a solution. Note that Beer’s Law is not valid at high solution concentrations.