For the data below, if a diluted (DF=100) water sample has an absorbance of 0.057, calculate the number of Cu atoms in a 100 mL sample. Answer using 3 significant figures. For Scientific Notation use this pattern example 6.02x10^23 Cu mg/L Absorbance 0 0.002 2 0.045 0.093 0.133 0.177 0.197 460 8 10
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- A 0.1 g amine-containing compound is dissolved in water then diluted to 100 mL. You subject it to spectroscopic analysis, in order to get the concentration of amine in this compound. Next, you get 1 mL of the previously diluted sample then dilute it again to 250 mL for measurement. Then, you fill 3/4 of a 1-cm cuvette with this diluted sample, and you run an analysis using an AAS. The recorded absorbance is 0.545 at 410 nm. What is the molecular weight of the compound? (The molar absorptivity is 1.23 x 104 cm-1 mol-1 L.)Caffeine (C8H10O2N4 • H2O) has an absorbance of 0.510 at 272 nm and 1 cm optical path in1 mg / 100 mL concentration solutions. A 2.5 g sample of soluble coffee is diluted withwater to 500 mL. Take 250 mL, add 25.0 mL of 0.1 N H2SO4 and dilute it to 500 mL. Theabsorbance at 272 nm resulting in 0.415. A) Calculate the grams of caffeine per kg of soluble coffee in the sample. Themolar mass of caffeine is 212 g / mol.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 %
- An unknown cobalt (II) chloride solution is measured to have an absorbance of 0.356. Calculate the molarity of the unknown cobalt (II) chloride solution using a spectrophotometer with a path length of 1.00 cm.A student was given a stock aluminum(III) solution with a concentration of 5.000 parts per million (ppm). (ppm are defined as mg/L for dilute aqueous solutions.) The student prepared five 100 mL standard solutions and an unknown as described in the procedure section of the experiment. The absorbance of each solution was read at 565 nm, using the blank to set zero absorbance. The results are tabulated below. Solution Volume of Al(III) stock solution used (mL) Absorbance 1 8.00 0.701 2 6.00 0.548 3 4.00 0.378 4 2.00 0.208 5 1.00 0.123 Unknown --- 0.534 3. What is your best estimate of the Al(III) concentration of the unknown sample in the cuvet based upon where its absorbance falls on the standard curve?From the following data, calculate the concentration of the analyte in the sample read at 700 nm: Absorbance of unknown sample = 0.807 Absorbance of a 130 mg/dl standard = 0.234 Do not answer in image format. Maintain accuracy and quality in your answer. Answer completely.
- Determine phosphate concentration of a water sample using the following information: Standard curve- slope: 1763.2 y-int: 0.011806 R^2: 0.99181 Absorbance of water sample: 0.013Solution. Vol. of A solution (mL) [methyl red], M Absorbance 1 10.00 _1.64 x10^-16_ _0.256_ 2 15.00 _2.45 x10^-16_. _0.373_ 3 20.00 _3.27 x10^-16_. _0.486_ 4 25.00 _4.09 x10^-16_. _0.620_ Plot a graph of the absorbance (y axis) as a function of the concentration of methyl red (x axis). What is the slope of the graph?The dye "Smoky Red" (SR) also reacts with NaOH(aq). You are in the lab and perform the following steps: Run1: 20 mL of SR stock solution (1.9 X 10-4 M) diluted to 100 mL 10 mL of NaOH stock solution (2.2 X 10-1 M) diluted to 100 mL at t=0, two above solutions are mixed SR Absorbance (Beer's Law constant = 1.2 X 105) is measured at 90 sec intervals Run2: 20 mL of SR stock solution diluted to 100 mL 20 mL of NaOH stock solution diluted to 100 mL at t=0, two above solutions are mixed SR Absorbance is measured at 60 sec intervals Reciprocal plot of SR absorbance gives q2 = 30.6 X 10-2 sec-1 The reaction of Smoky Red with sodium hydroxide solution is found to occur with a pseudo rate constant q1 of 7.3 X 10-2 sec-1. After Run 2 when volume of sodium hydroxide is doubled, q2 = 30.6 X 10-2 sec-1. Assuming the reaction is second order with respect to the dye, what is n for this reaction (round to the nearest whole number)?
- 1. How would you find the solution for this dilution and absorbance problem? What would the set-up for solving this look like? (A = 0.0252C(ppm) - 0.0162)The glucose content of samples can be determined using Nelson’s test. The equation of the line for the standard curve prepared for varying concentrations of glucose is y = 3.0x + 0.2. Based on this information, determine the glucose concentration (in M) of a mango preserve having an absorbance reading of 0.891.How many grams of NaAsO, should be weighed out to prepare a stock solution of 100 mg/L in 500 mL deionized water. Use the stock solution to prepare 4 different standard solution that can be used to prepare an analytical calibration curve to measure the concentration of 750 sample in the concentration range of 10-35 mg/L. Draw a proposed calibration curve (based on the results you achieved).