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# The chromium in a series of steel samples was determined by fCP emissionspectroscopy ## Problem 10-11 Chapter 10

Principles of Instrumental Analysis | 6th Edition

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Problem 10-11

The chromium in a series of steel samples was determined by fCP emissionspectroscopy. The spectrometer was calibrated with a series of standardscontaining O.2.0, -l.O,6.0. and 8.0 /lg K,Cr,O, per milliliter. The instrument readings for these solutions were 3.1, 21.5, 40.9, 57.1, and 77.3. respectively, inarbitrary units.(a) Plot the data using a spreadsheet.(b) Find the equation for the regression line.(c) Calculate standard deviations for the slope and the intercept of the line in (b).(d) The following data were obtained for replicate 1.00-g samples of cementdissolved in HCI and diluted to 100.0 mL after neutralization.Calculate the percentage of Cr,03 in each sample. What are the absoluteand relative standard deviations for the average of each determination?

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I. Chapter 11 Continued A. Concentration Units 1. Molarity (M) a. M = moles/liters b. [KCl] means molarity of a KCl solution 2. Molality (m) a. m = moles/kg of solvent b. mass-based and independent of temperature 3. Mass Fraction a. Mass fraction = mass...

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##### ISBN: 9780495012016

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The chromium in a series of steel samples was determined by fCP emissionspectroscopy

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