The partial vapour pressures of each component in a mixture of propanone (acetone. A) and trich loromethane (chloroform, C) were measured at 35 °c with the following results: Xc                    0     0.20     0.40     0.60    0.80      1                                              pc/kPa          0     4.7         10     17.9     28.0      36.4                                        pA/kPa     43.6     32.3     23.3     12.3    4.9         0 Confirm that the mixture conforms to Raoult's law for the component in large excess and to Henry's law for the minor component. Find the Henry's law constants.

Mixing 150.0 mL of 1.50 M Ba(NO3)2 (aq) with 250.0 ml of 5x10-2M Na2SO4 at 25°C. The Ksp of barium sulfate is 1.08x10-10M2 at 298 K. What is the final concentration of barium ion in the solution.

The Gibbs energy of mixing of a regular solution of components A and B is given by Greal = nRT (x Inx +x Inx +ẞXX), where X and X are mix A B B A B the mole fractions of the two components and ẞ is a dimensionless parameter quantifying deviations from ideal behaviour in terms of the relative strength of A-B interactions compared to A-A and B-B interactions. (i) Use a spreadsheet to calculate A Greal/nRT for XA = 0.01, 0.125, mix 0.25, 0.5, 0.75, 0.875 and 0.99 for ẞ= 0, 1 and 3. Report your calculations in a table and, using a labelled plot, determine the numbers of minima in A Greal/nRT as a function of composition and ẞ. mix [3 (ii) For each value of ẞ, predict the number of liquid phases which you would expect for the mixture. Justify your answer in terms of A-B interactions. [

2) Draw the isobaric phase diagram at 1 atm of the following two-component liquid system: water (Boiling point = 100°C) and nitric acid (Boiling point = 86°C), with the mass percentage of nitric acid on the x-axis. When the liquid mixture contains 68 % nitric acid, an azeotrope with a boiling point of 120.5°C, is formed. Use the sketch to describe under which conditions pure nitric acid can be obtained by means of isobaric distillation.