Three extractions with 50 ml portions of chloroform removed 97% of a solute from 200 ml of an aqueous solution. Calculate the partition coefficient of the solute: KD=Cchioro/Caq- Two weak bases (organic amities) have basic dissociation constants of KbA= 1 x 10-4 and KbB = 1 x 108. Both bases have partition coefficients of approximately 10 between chloroform and water. Describe a procedure, making use of the difference in kb, for separating the two by extraction. Two weak acids, HX and HY, have partition coefficients, KD = Cet/Caq, of 5 and 50 respectively, and dissociation constants of 1 x 104 and 1 x 10-8, respectively. Calculate the distribution ratios of the two acids at integral values of pH of the aqueous solution from pH 4 to pH 11, assuming equal volumes of the two solvents. What is the minimum pH for which the ratio of D values is at least 105?

The following equation describes the dependence of the rate constant (k) with the temperature in dynamic NMR. kgTc -AG*. exp (- RT. k = C where kg and h are physical constants, R is the ideal gas constant, T. is the coalescence temperature and AG* is the activation energy? The following table shows the units of some of these parameters. Parameters Units k s-1 To K h Js R JK-' mol-! AG* J mol- Does k increase with AG*? Explain your answer.

Analyze the mass spect (including fragmentations) for the molecular structure of vanillin (C8H8O3). M=152

A. Draw structure of compound. B. Label base peak and molecular ion peak.

Predict relative intensities at m/z 36, 37, and 38 for HCl. Let the intensity of the molecular ion be 100 and disregard contributions ,0.1%.

Complete the Kal expression for H₂CO3 in an aqueous solution. Kal = 4.45 x 10-7 = [H₂CO3] [H3O+] Answer Bank [HCO3] [H₂0+1² [CO]

Acetone has a partition coefficient of 13 while DCM has a partition coefficient of 4.6. Why is DCM used for the extraction of caffeine from Black teabags?

I am having trouble finding the delta S rxn of ammonium chloride. I am using stand thermodynamic values found online, but I can't find the value for NH4OH. I am using 94.6 for NH4CL and 69.94 for H2O. From this, I am supposed to find delta G using 411.43 as my q sys, 3.55 as my delta T, and 8.229 as my delta H.

By what factor must the applied magnetic field be increased for the relative population difference (Nɑ - Nβ)/N to be increased by a factor of 5 for (i) 1H nuclei, (ii) 13C nuclei?