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art A: mean Activity coefficients
(1) Examine the effect of changing the value of molality on the mean activity coefficients1 γ± [0.2mol, 0.02mol, 0.1mol ,0.03 0.01mol]for a given ionic compound [KBr]. Select 5 molalities in the mmol/kg range. Make a table of values of molality, ionic strength (I), and γ± .
Make a plot of log γ± vs square root of ionic strength, I½ .
(2) Study the effect of changing the charge number of ions on the mean activity coefficients γ± at a constant molality of 1 mmol/kg for several ionic compounds [KBr] you select.
(3) What is the conclusion on effect of molality (ionic strength) and ionic charge numbers on γ± ?. Where is the deviation from ideal behavior is most likely? Explain.
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- 4.columns with one million theoretical plates operating by slip flow. The figure shows the gradient separation of two forms of fluorescently labeled bovine serum albumin separated on a)50 x 2.1 mm UHPLC column of 1.7 µm C4 silica particles and b)10 mm x 75µm colloidal crystal column of 470 nm C4 silica nanoparticles. What are the main differences in the chromatogram? What is the reason for the difference? Why does the colloidal crystal column have such a high number of theoretical plates (N)? How is the problem of high pressures with very small particles overcome?Consider a saturated solution of barium iodate in 0.025 M BaCl2. For the salt: Ba(IO3)2(s) ⇌ Ba2+ + 2IO3- Ksp = 1.57 \times× 10-9 at 25 deg C What is the activity coefficient of Ba2+? Consider a saturated solution of barium iodate in 0.025 M BaCl2. For the salt: Ba(IO3)2(s) ⇌ Ba2+ + 2IO3- Ksp = 1.57 × 10-9 at 25 deg C What is the activity coefficient of Ba2+?. 0.439 0.364 0.276 0.405The distribution coefficient (K) of formic acid (HCO2H) in 1-octanol versus water is 0.39. If a solution of 4.00 grams of formic acid in 100.00 mL of 1-octanol is extracted with one 10.00 mL portion of water, how many grams (to the hundredths place) will remain in the organic layer?
- Based on the following molarities obtained,1.00 x10^-1 , 1.04 x10^-1 and 1.0 2x10^-1. fine the average molarity and standard deviation.Pure toluene (C7H8) has a normal boiling point of 111.0°C, and the Boiling Point Elevation Constant is 3.40°C. When 25g of compound A (MM=100) is dissolved in 500g of Toluene, the boiling point of the solution is 113.2°C. Therefore, the activity coefficient of the compound (γA) in the solution is approximately: a) 1.3 b) insufficient data c) 0.65 d) 0.8 (The answer according to the professor is 1.3, but I have tried and can't get that answer, thanks for the help)Percentage or Ratio Strength Concentration.Show your complete solution. 1. If 250 mL of 15% (v/v) solution of methyl salicylate in alcohol is diluted to 1500 mL, what will be the percentage strength (v/v) of the final solution? *Note: Indicate the unit. Give your answer in 2 decimal places. Example 100.00 %
- Calculate the solubility of MgF2 (MW = 62.3 g/mol) in water at 25 °C if its Ksp is 7.4 x 10-11.? No need to write the unitsThe vapor pressure of 2-propanol (60.096 g/mol) is 50.00 kPa at 338.8 °C, but it fell to 49.62 kPa when 8.69 g of an involatile organic compound was dissolved in 250 g of 2-propanol. Calculate the molar mass of the compound.Estimate the mean ionic activity coefficient of CaCl2 in a solution that is 0.010 mol kg−1 CaCl2(aq) and 0.030 mol kg−1 NaF(aq) at 25 °C.
- A student dissolved 20 mg of caffeine in 20 mL of water. The student carried out two extractions using 20 mL of dichloromethane in each one. Caffeine solubility in water: 2.17 g / 100 mL at 25 ° C Caffeine solubility in dichloromethane: 10.0 g / 100 mL at 25 ° C Present the calculations in detail below. A. Determine the distribution coefficient. b. Determine the amount of caffeine obtained in the first extraction. C. Determine the amount of caffeine obtained in the second extraction. 77 D. Determine the total amount of caffeine extracted during the entire process. and E.Determine the percent recovery.Calculated solely at 25 Celsius of PbCrO4 in pure water and in a .0130M. Na2CrO4 solution. Ksp of PbCrO4 is 2.8x10^-13calculate the sulablity Iat 25 Celsius of Ni(OH)2 pure water and then .01 80 M NaOH solution. Ksp of Ni(OH)2 is 5.48x10^16 additional info in the picture