Calculate the activity of 103° in a saturated solution of La(IO3)3 in water. Кр 3 1.0 x 10-11 а. 2.0 х 103 b. 1.7 x 104 с. 2.7 х 103 d. 1.2 x 10-3 е. 3.9 х 103 f. 4.8 x 10-4
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- GFE&E 2. At what pressure, in atm, does H2O have an activity of 2.00? Assume a temperature of 25 oC and a molar volume of 18.07 cm3.3. You performed an experiment in order to determine the quantitative analysis of total aldehyde content in 5 g of Lemon oil. During the titration step, you used 2 mL of 0.5 N KOH. Calculate the total aldehyde content of the oil over citral (MW citral : 152, f 0.5 N KOH = 1, MW KOH: 56.1, MW HCL: 36.5)Assume that the concentration for both Ca+2 and SO42- was initially 1.0 x 10-3 M. Using the activity coefficients, what are the activities for Ca+2 and SO42- ?
- 150 ml of 0.01 mol/l HCl solution and 150 ml of 0.007 mol/l HNO3 solution were mixed. What is the activity of individual ions in the resulting solution?In the adsorption of a certain solute, from an aqueous solution on activated carbon at 21°C, the Freundlich constants are n=2.319 and K=0.702 when the equilibrium concentration c is expressed in mol/L a) If 0.1186 g. of this solute is adsorbed on 0.5017 g. of activated carbon at 21°C, find c b) Find the molar mass of solute adsorbed from 0.05 L of a solution whose initial concentration is 0.120 M.Suppose that something had gone wrong in the Big Bang, and instead of ord inary hydrogen there was an abundance of deuterium in the universe . There would be many subtle changes in equilibria, particularly the deuteron transfer equilibria of heavy atoms and bases. The Kw for D2O, heavy water, at 25 °C is 1.35 x 10-15. (a) Write the chemical equation for the autoprotolysis (more precisely, autodeuterolysis) of D2O. (b) Evaluate pKw for D2O at 25 ° C. (c) Calculate the molar concentrations of D3O+ and OD- in neutral heavy water at 25 °C . (d) Evaluate the pD and pOD of neutral heavy water at 25 °C. (e) Formulate the relation between pD, pOD, andpKw(D2O).
- Draw a sketch of the Langmuir isotherm at a pressure of 0.001kPa-1.If the concentration of Sn2+ ions in a solution of Sn(OH)2 was measured to be (1.24x10^-3), what is the Ksp value for Sn(OH)2?If the influent concentration of contaminant X is 0.064 mg/L, then what dose (mg/L) of powdered activated carbon is required to provide an effluent concentration of 0.002 mg/L. It is a freundlich isotherm with these parameters K = 830 and 1/n = 0.63. How do I plug in these values to figure out the concentration of AC.
- The oxidation of iodide ion by the hypochlorite ion in the presence of hydroxide ions I(aq) + ClO(aq) IO(aq) + Cl(aq) was studied at 25 C, and the following initial rates data (Y. Chia and R. E. Connick, Journal of Physical Chemistry, Vol. 63, p. 1518, 1959) were collected: (a) Determine the rate law for this reaction. (b) One mechanism that has been proposed for this reaction is the following: Show that the rate law predicted by this mechanism matches the experimentally determined rate law in part a. (Note that when writing the expression for K the equilibrium constant, [H2O] is not involved. See Chapter 15.)The first stage in corrosion of iron upon exposure to air is oxidation to Fe2+. (a) Write a balanced chemical equation to show the reaction of iron with oxygen and protons from acid rain.Using the Arrhenius equation, one can design experiments to find the activation energy, Ea. k = Ae-Ea/RT Using the following data for the N2O5 decomposition, calculate the average Ea using at least 3 values of Ea to find the average and standard deviation. k(s-1) T (oC) T (K) 2.0 x 10-5 20 7.3 x 10-5 30 2.7 x 10-4 40 9.1 x 10-4 50 2.9 x 10-3 60 Note the value of R is 8.3144 J/K mol.