Using the concentrations found in the experiment for the iron cation and thiocyanate anion determine the Kc for iron (III) thiocyanate using 1.71mL of iron cation solution and 4.00 mL of thiocyanate anion solution. The absorbance for this mixture at 460 nm is 0.339.
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Using the concentrations found in the experiment for the iron cation and thiocyanate anion determine the Kc for iron (III) thiocyanate using 1.71mL of iron cation solution and 4.00 mL of thiocyanate anion solution. The absorbance for this mixture at 460 nm is 0.339.
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- If the absorbance for the solution was 0.698, calculate the equilibrium concentration of iron(III) thiocyanate in the solution. Report your answer in mM with three places after the decimal.A colored ion solution has a concentration of 0.200 M with a measured absorbance A = 0.880. Another ion solution made of the same chemicals has an absorbance A = 0.172. What is the concentration of this unknown sample solution?If a solution has a 1max of 500 nm, what is the likely color of the solution? red orange blue green yellow violet
- Scott test is one of the methods used for screening for Cocaine in Forensic Chemistry. The multi step method consists of a) reacting the sample drug with cobaltous thiocyanate b) dissolving of the formed precipitate by adding HCl and c) extraction of coordination compound with Chloroform d) measurement of absorbance of extracted coordination compound at 627 nm. Which molar absorptivity will you use to calculate concentration of cocaine ? a.cocaine molar absorptivity b.cocaine -cobaltous thiocyanate complex molar absorptivity. c.HCl - cobaltous thiocyanate molar absorptivity d.cobaltous thiocyanate molar absorptivityA 131.7 mg sample of powdered Carbamazepine tablets was boiled with ethanol, filtered and then made up to 100 mL with ethanol. 5 mL of this solution was then diluted to 250 mL with ethanol and the absorbance at 285 nm found to be 0.486 in a 1cm path length cell.Calculate the content (% m/m) of Carbamazepine in the powder, taking A(1%, 1 cm) as 490.(State your answer to 1 decimal place and include the units)a) If an unknown sample containing FeSCN2+ has an absorbance of 0.542, what is the concentration of FeSCN2+ in the unknown sample? b) What are the units of concentration? c) If the path length of light is 13.5 mm (millimeters), what is the absorptivity coefficient, ?ε, for FeSCN2+? d) What are the units of the absorptivity coefficient, ?ε?
- Suppose that you follow the procedure and find the absorbance of the final solution to be 0.475. What is the concentration of Fe (mg/L) in the final solution?A solution in part C initially contains (4.1000x10^-4) molar SCN¯ and (1.180x10^-1) molar Fe3+. This solution was then measured using the colorimeter, and an absorbance of (5.150x10^-1) was recorded.The constant determined in part A of the experiment was found to be (3.47x10^3). Using the absorbance and constant provided, determine the equilibrium concentration of FESCN2+, [FESCN2*]E. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: х10 Answer units1) A Chem 102 Student prepared a cobalt coordination compound. Parts "a-c" refer to this problem. a) Next, she analyzed the cobalt content of the compound by preparing a series of known concentration cobalt solutions and prepared a Beer's law graph of absorbance (Y) versus concentration(X). The equation of the line was determined using Excel to be: Y=7.50 X the coordination compound and ultimately diluted it to a total volume of 100.0 mL and measured its absorbance to be 0.310. Calculate the percent cobalt (by mass) in the compound. Where X is concentration in Molarity. She weighed 1.1050 g of
- Spectroscopy and a Calibration Curve Prepare a series of standard solutions of the colored compound with known concentrations by diluting the stock solution with distilled water. Use volumetric flasks to ensure accurate dilutions. Let's assume we have a stock solution of potassium permanganate (KMnO4) with a concentration of 0.100 M (molar). We will prepare five standard solutions with the following concentrations by diluting the stock solution with distilled water: 0.020 M 0.040 M 0.060 M 0.080 M 0.100 M Measure the absorbance of each standard solution at the wavelength of maximum absorbance (λmax) using the UV-Vis spectrophotometer. Record the absorbance values. For 0.020 M: Absorbance = 0.150 For 0.040 M: Absorbance = 0.290 For 0.060 M: Absorbance = 0.440 For 0.080 M: Absorbance = 0.580 For 0.100 M: Absorbance = 0.730 Plot a calibration curve by graphing the absorbance values (y-axis) against the corresponding concentrations (x-axis) of the standard solutions. Use a linear…You prepare several dilutions of an unknown compound. You measure the pance of each solution at 340 nm using a 1 cm cuvette (your results are listed in the table- -). What is the extinction coefficient (in (Mecm)') of the compound? (Hint: assume that of the individual values contains some degree of experimental error.) entration(µM) Absorbance at 340 nm 0.011 0.023 0.066 0.119 0.189Most iron (III) compounds are very weakly colored, and do not lend themselves well to visible spectrometric analysis. What is one possible reliable way to improve the analysis? Find a different way to analyze the sample Use a larger sample Complex the iron with another chemical to increase its absorbance Analyze something else