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- Calculate the specific absorbance ratio (SAR), where A620 = 0.285 and A280 = 0.795. Enter your result with 3 decimal places.The equation of your standard curve of absorbance versus concentration (mM) is y = 1.245x + 0.0012. You put a solution of unknown concentration into the Spec20 and get an absorbance value of 0.227, which lies within the standards used to make the standard curve. What is the concentration of the unknown solution in mM?A standard curve of absorbance vs. concentration has a linear trendline of y = 0.56x + 0.987. Use this trendline to calculate the concentration of an unknown sample that has an absorbance of 1.245.
- When using cuvettes to measure the absorbance of a solution, why is it necessary to only hold the cuvettes near the top?The nickel level in a soil sample was determined using AAS. A 3.0 g sample was dissolved in acid and then diluted to a total volume of 100.0 mL. The absorbance of this solution determined at a wavelength of 232 nm, was found to be0.3. Several standard solutions were tested under the same conditions and a calibration curve shown below was obtained. Calculate the mass of nickel in mg.A standard curve was performed using an Absorbance spectrophotometer, and the equation of that line was determined to be y = .1563x + .025. The absorbance of an unknown was measured at .35. Calculate the concentration of the unknown according to the standard curve.
- Find the concentration of benzene in hexane if the absorbance is 0.188 in a 1.000-cm cell.Does sunlight affect uv vis spectrophotometer ? is this statement true? ''Sunlight can dim the measurements by heating the instrument, leading to inaccurate measurements.''Plot a calibration graph of absorbance vs concentration of Ca2+ and determine the concentration of Ca2+ in the unknown tap and unknown bottle water samples.
- A relationship between concentration in mg/dL and light absorption in absorbance units is given by the equation: y = 1.2x + 0.28. If concentration is graphed on the x-axis and absorbance is on the y-axis, determine the concentration in mg/dL for a sample with an absorbance value of 0.94A protein’s concentration can be determined spectrophotometrically by mixing it with an indicator called a Bradford reagent and measuring the amount of light absorbed by the protein. Use the plot below to determine the mass of protein (in micrograms, μμg ) in 100.0 mL of the solution if its absorbance is 0.398. A. 52 B. 3.1 C. 2.4 D. 0.52 E. 0.031(a) At which wavelengths did each solution have the highest % transmittance? (b) Do the wavelengths (at the highest % transmittance) match to the color of the solution in the visible light range? Why or why not? Purple: 380 – 450 nm Green: 495 – 570 nm