Palladium(II) forms an intensely colored complex at pH 3.5 with arsenazo III~ at 660

Chapter 14, Problem 14-19

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Palladium(II) forms an intensely colored complex at pH 3.5 with arsenazo III~ at 660 nm.33 A meteorite was pulverized in a ball mill, and the resultmg powderwas digested with various strong mineral acids. The resultmg solutIon was evaporatedto dryness, dissolved in dilute hydrochloric acid, and separated from mterferentsby ion-exchange chromatography. The resulting solutton contamm,g anunknown amount of Pd(lI) was then diluted to 50.00 mL With pH 3.5 buffer.Ten-milliliter aliquots of this analyte solution were then transferred to SIX50~~Lvolumetric flasks. A standard solution was then prepared that was 1.00 X 10 t Min Pd(II). Volumes of the standard solution shown in the table were then pIpe -ted into the volumetric flasks along with 10.00 mL of 0.01 M arsenazo III. Eachsolution was then diluted to 50.00 mL, and the absorbance of each solution wasmeasured at 660 nm in I.oo-cm cells.Enter the data into a spreadsheet. and construct a standard-additions plot ofthe data.Determine the slupe and intercept of the line (c) Determine the standard dcviation of the slope and of the intercept.(d) Calculate the concentration of Pd(II) in the analne solution.(e) Find the standard deviation of the measured concentration.

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