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Concentration=2.5 X 10^3 μM
OD400nm=0.859
1cm cuvette is used
what is the extinction coefficient (μM^-1 cm^-1)
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- List and define the indicators that are used to assess the performance of a specific analytical method under specified conditions.After creating her standard curve for absorption versus the concentration (M) of FD&C Red 40 and processing her data, Sally found that her drinking strength Kool-Aid sample had an FD&C Red 40 concentration of 1.086 x 10–5 M. If 0.133 grams of Kool-Aid powder was used to prepare an 8-fl oz cup of her assigned flavor, what is the percent by mass of FD&C Red 40 in her Kool-aid powder?Was the gradual color change observed when the sodium thiosulfate (Na2S2O3) crystal was added to the aqueous solution of KI/12 in Station Cevidence of a chemical or physical change?
- A calibration curve of KCl conductivity (y-axis) vs concentration (mass percent, x-axis) is made. The equation of line of best fit is y = 578.3x + 0.380 and the R 2 is 0.9998. Based on this data what is the mass percent of an unknown KCl solution with a conductivity of 2,788 uS/cm? 6.55 % 6.12 % 4.14 % 3.98 % 4.82 %what is the significance of gravimetry analysis?A 1 mL sample of glycogen was calculated to contain 35 µmol (micromole) glucose. To 1 mL of this sample was added 2 mL of 2 M HCL. It was then hydrolysed by boiling the solution for 15 minutes. After boiling the hydrolysate was cooled and made up with H2O to a final volume of exactly 10 mL. The glucose was measured in this solution and found to have a concentration of 570 µg/mL (microgram/milliliter). i) Calculate the mass (mg) of glucose in the 10 mL of hydrolysate. As the 1mL of glycogen sample was made up to a final volume of 10 mL, this mass of glucose was produced by the hydrolysis of the original 1 mL glycogen sample. ii) Calculate the amount (µmol) of glucose produced by the hydrolysis of the glycogen sample. iii) Calculate the purity of the glycogen used in the sample as % Purity = (moles of measured glucose/ moles of calculated glucose in glycogen) *100 iv) state your answer in a complete sentence.