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Chapter 26: Q37P (page 749)
Measure the number of plates for the electrophoretic peak in Figure 26-20. Use Equation 23-32 for asymmetric peaks to find the number of plates for the chromatographic peak.
The number for the electrophoretic peak is
The number for the chromatographic peak is
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(a) The interstitial volume, , in Figure 26-15 is the volume at which the curves rise vertically at the left. Findfor the 25-nm-pore-size column. To the nearest order of magnitude, what is the smallest molecular mass of molecules excluded from this column? (b) What is the molecular mass of molecules eluted at 9.7 mL from the 12.5-nm column? (c)is the volume at which the curves drop vertically at the right. Find the largest molecular mass that can freely enter the 45-nm pores.
(a) How many moles of analyte are present in asolution that occupies 1.0% of the length of acapillary?(b) What voltage is required to inject this many moles into a capillary in 4.0 s if the sample has 1/10 of the conductivity of background electrolyte, and the sample concentration is
A gel filtration column has a radius, y.of 0.80 cm and a length,l, of 20.0 cm
(a).Calculate the volume,of the column, which is equal to
(b). The interstitial volumewas 18.1 mL and the total volume of mobile phase was 35.8 mL.
Find.for a solute eluted at 27.4 mL.
Totarlsulfexperimevt: Inorganic cations can be quantified by passing a salt solution throagh a cation-exchange columan in the form and titruting the relcasod H+with strong base. The moles of titrant equal the equivalenss of catioa charge in solution.
(a) What volume of 0.0231 M NaOH is needed to titrate the eluate when 10.00ml of ,have been loaded on a cation exchange columan in the H+foem?
(b) A 0.2692g sample of unknown salt is dissolved in demonized waler and loasedoato a cation exchange column in the H+form. The columin is rinsed with deionined water and the combincd loading and rinse solutions are titrated with 0.1396M KOH. A volume of 30.64mL is required to reach the endpoint. How many equivalents of cation are in the sample? Find the millieguivalents of cation per gram of sample (meq/g).
(c) The mass of substance containing one cquivalent is called the equivalent mas. If the cation has a +1 charge, the equivalent mass equals the molar mass. If the cation has a +2 charge, the equivalent mass is half the molar mass. What is the equivalent mass of the sample in (b)?
What is the effect on injection time if you decrease the applied voltage by a factor of 2?
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