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Chapter 0: Q3P (page 9)
What does it mean to mask an interfering species?
To "mask an interfering species" refers to the removal of the interfering ability of an object.
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An unknown sample of Cu2+gave an absorbance of 0.262 in an atomic absorption analysis. Then 1.00 mL of solution containing 100.0 ppm (=g/mL)Cu2+was mixed with 95.0mL of unknown, and the mixture was diluted to 100.0mL in a volumetric flask. The absorbance of the new solution was 0.500.
(a) Denoting the initial, unknown concentration as [Cu2+]i, write an expression for the final concentration,Cu2+f, after dilution. Units of concentration are ppm.
(b) In a similar manner, write the final concentration of added standard Cu2+, designated as [S]f.
(c) Find [Cu2+]i in the unknown.
Control chart -- Volatile compounds in human blood serum were measured by purge and trap gas chromatography/mass spectrometry. For quality control, serum was periodically spiked with a constant amount of -dichlorobenzene and the concentration role="math" localid="1663334314380" was measured. Find the mean and standard deviation for the following spike data and prepare a control chart. State whether or not the observations (Obs.) meet each criterion for stability in a control chart.
Consider the following equilibria in aqueous solution:
(1)
(2)
(3)
(a) Calculate the numerical value of the equilibrium constant for the reaction.
(b) Calculate the concentration ofin equilibrium with excess undissolved solid AgCl.
(c) Find the numerical value offor the reaction
The metal ion indicator xylenol orange (Table 12-3) is yellow at.The spectral changes that occur asis added to the indicator atpH6 are shown here. The mole ratio/xylenol orange at each point is
Suggest a sequence of chemical reactions to explain the spectral changes, especially the isosbestic points at457 and 528nm.
Absorption spectra for the reaction of xylenol orange withatpH 6.0
A titration curve for Na2CO3 titrated with HCl is shownhere. Suppose that both phenolphthalein and bromocresol green arepresents in the titration solution. State what colors you expect to
observe at the following volumes of added HCl:
2 mL; (b) 10 mL; (c) 19 mL.
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