A 50 mL aliquot of river water is treated with a conditioning solution, which is stirred and recorded at 500 nm. The equipment reading indicated 40.5% Transmittance with 1.5 cm optical path cuvettes. Calculate the ppm of sulfate (PM 96 g / mol) in river water if a standard of 3.0x10-5 mol / L of sulfate, under the same conditions, gave 55% Transmittance in cuvettes with 1.5 cm of passage. optical.

A 50 mL aliquot of river water is treated with a conditioning solution, which is stirred and recorded at 500 nm. The equipment reading indicated 40.5% Transmittance with 1.5 cm optical path cuvettes. Calculate the ppm of sulfate (PM 96 g / mol) in river water if a standard of 3.0x10-5 mol / L of sulfate, under the same conditions, gave 55% Transmittance in cuvettes with 1.5 cm of passage. optical.

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter9: Atomic Absorption And Atomic Fluorescence Spectrometry

Section: Chapter Questions

Problem 9.12QAP

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To quantify the Cadmium content in a water sample, 5 aliquots of 10 mL were taken, adding to each one of them a volume of a standard solution of Cd (2 mg / mL); after the addition the final volume for all solutions was 50 mL. The absorbance reading was taken in an Atomic Absorption spectrophotometer, the data recorded were: Aliquot 1 2 3 4 5 Cd solution (mL) 0 1 2 3 4 Absorbance 0.163 0.240 0.319 0.402 0.478 Calculate the ppm of Cd.
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The validation process comprises four main steps that are : hardware validation, software validation, method validation and system suitability. To evaluate a spectrophotometer’s accuracy by measuring absorbance, a solution of 60.06 mg/L K2Cr2O7 in 0.0050M H2SO4 was carefully prepared together with a 0.0050 M H2SO4 as a reagent blank. If the spectrometer’s signal is properly calibrated, it has been reported that this solution should provide an absorbance of 0.640 +- 0.010 at wavelength 350 nm. Which one of the validations mentioned above had been involved in this process? Explain your choice
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You created a standard curve and calculated the slope to be 66.41. After synthesizing your copper network, you weighed 0.052 grams of your copper product, worked it up with nitric acid, buffer, and ammonia and added it to a 25 mL volumetric flask. Then, you measured the absorbance of your solution and received a value of 0.29. What is the % mass of copper in your product?
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