The copper in an aqueous sample was determined by atomic absorption flame spectrometry. First, 10.0 ml of the unknown were pipetted into each of five 50.0-ml volumetric flasks. Various volumes of a standard containing 12.2 ppm Cu were added to the flasks, and the solutions were then diluted to volume. Unknown (mL) Standard (mL) Absorbance 10.0 0.0 0.201 10.0 10.0 0.292 10.0 20.0 0.378 10.0 30.0 0.467 10.0 40.0 0.554 A. Plot absorbance as a function of the concentration of Cu standard after final dilution and determine the equation of the line and determine the x-intercept. Calculate the copper concentration in ppm Cu in the aqueous sample.

The copper in an aqueous sample was determined by atomic absorption flame spectrometry. First, 10.0 ml of the unknown were pipetted into each of five 50.0-ml volumetric flasks. Various volumes of a standard containing 12.2 ppm Cu were added to the flasks, and the solutions were then diluted to volume. Unknown (mL) Standard (mL) Absorbance 10.0 0.0 0.201 10.0 10.0 0.292 10.0 20.0 0.378 10.0 30.0 0.467 10.0 40.0 0.554 A. Plot absorbance as a function of the concentration of Cu standard after final dilution and determine the equation of the line and determine the x-intercept. Calculate the copper concentration in ppm Cu in the aqueous sample.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

Question 9 only
One common way to determine phosphorus is by mixing 12-molybdophosphate complex with ascorbic acid to give an intense blue-colored species called molybdenum blue. The absorbance of molybdenum blue can be measured at 650 nm. A calibration graph was constructed as follow. Deduce the analytical technique used and calculate the concentration of unknown water samples analyzed which demonstrated absorbance reading of 0.269 (sample 1), 0.532 (sample 2) and 0.478 (sample 3). P calibration curve 0.8 0.6 0.4 y = 0.218x + 0.004 R2 = 0.9996 0.2 0.5 1 1.5 2 2.5 3 3.5 Concentration (ppm) Absorbance
Given the following size frequency for a dust: Size Interval (um) 7-17.5 17.5-21 21-25 25-28 28-30 30-33 33-36 36-41 41-49 49-70 % by Number 10 10 10 10 10 10 10 10 10 10 a. Plot the cumulative frequency distributions (in %) of the number, surface area, and mass on linear graph paper assuming all particles are spheres with Pp 1.6 g cm ³. = b. Is this a log-normally distributed dust?
PLEASE ANSWER ASAP
-Explain The relation between the concentration and absorption based on beer's law in details.
None
What is the molar extinction coefficient at 625 nm for this copper (II) acetate solution? How was it determined? Standard Solution Concentration (M) Absorbance 1 0.025 0.049 2 0.050 0.153 3 0.100 0.242 4 0.200 0.499 5 0.250 0.694
In determining the concentration of a sample X, it was found that it has maximum absorbance at 275 nm. Compound X, has molar absorptivity at 275 nm of 8400 L / mol.cm. Using a spectrophotometer with a 1 cm cuvette, an absorbance of 0.70 was found. What is the concentration of compound X in the sample?
6. The UV-Vis absorption spectrum was measured for three different concentrations (10 mM, 20 mM, and 30 mM) of an analyte that we will call orangium as shown in the figure below. A 1.000 cm cuvette is used for all of the experiments. 1.00 0.90 0.80 0.70 0.60 a 0.50
Maria was tasked to determine the concentration of a Fe2(SO4)3 solution. She prepared 5 different standards of Fe2(SO4)3 using the table below as her guide. She ran the standards and the unknown solution through UV-VIS spectroscopy and recorded the absorbances of each solution. HINT: use the dilution equation to determine the concentration of Fe2(SO4)3 in each test tube before preparing the standard curve. NOTE: No need to force the line to pass through zero. Just graph the data as is. What is the slope of the line of the standard curve from the given data? What is the concentration of the unknown solution?
None
1- While cleaning out a laboratory shelf, you have made a mistake in labeling two bottles of ethanol and acetic acid. To identify the molecular structure of the contents of the bottle, samples were submitted for analysis using infrared spectroscopy, based on the IR results, draw the molecular structure of the molecule that would correspond to the spectrum for that compound. Justify your answer Spectrum A Spectrum B 0. 04 0.2 3000 2000 Waverumber icm-1) 1000 Transmitance