Chapter 0: Q3P (page 1)
What does the designation 200/400mesh mean on a bottle of chromatography stationary phase? What is the size range of such particles? Which particles are smaller,100/200or 200-400mesh?
200/400 mesh are smaller.
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To pre-concentrate cocaine and benzoylecgonine from river water described at the opening of this chapter, solid-phase extraction was carried out at using the mixed-mode cation-exchange resin in Figure 28-19. After passing of river water through of resin, the retained analytes were eluted first with of and then with ammonia solution in
. Explain the purpose of using
for retention and dilute ammonia for elution.
25-1 What should be the volume flow rate and injected volume for a 1.5-mm-diameter column?
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
Write the reaction of phosphoric acid and the reaction of disodium oxalate.
How many milliliters of 0.202MNaOHshould be added to 25.0 mlof 0.0233Msalicylic acid (2-hydroxybenzoic acid) to adjust the pHto 3.50?
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