Question 1 a) Sore-throat medications sometimes contain the weak acid phenol, HC6H30. A 0.10 M aqueous solution of pheno

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Question 1 A Sore Throat Medications Sometimes Contain The Weak Acid Phenol Hc6h30 A 0 10 M Aqueous Solution Of Pheno 1 (132.9 KiB) Viewed 22 times

Question 1 a) Sore-throat medications sometimes contain the weak acid phenol, HC6H30. A 0.10 M aqueous solution of phenol has a pH of 5.43 at 25 °C. What is the acid-ionization constant, K, for phenol at 25 °C?. (6) b) Calculate the hydronium and hydroxide ion concentration at 25°C in i) 0.10 M HCI (5) ii) 1.4 x 10" M Mg(OH)2 (5) c) What are the pH and ion concentrations in a solution of 0.10 M sodium formate, NaHCO2? Ko for the formate ion, HCO, is 5.6 x 10". Show all your calculations. (6) d) Calculate the pH of typical adult human blood, which has a hydronium ion concentration of 4.0 x 10-8 M. (2) e) The pH of natural rain in 5.60. What is the hydronium ion concentration? (1) f) Calculate the hydronium ion concentration and pH of the solution that results when 22.0 mL of 0.15 M acetic acid, CH3CO2H, is mixed with 22.0 mL of 0.15 M NaOH. The kh value is 5.6x10-10 (7) Question 2 a) Calculate the pH of the following buffer solution: (5) H2PO4 (0.10 M) / HPO42- (0.25 M) The pK, value of the dihydrogen phosphate ion is 7.20. b) Define the term buffer solution. (2) c) What is the pH of a buffer made by mixing 1.00 L of 0.020 M benzoic acid, HC2H5O2, with 3.00 L of 0.060 M sodium benzoate, NaC H5O2? Ka for benzoic acid is 6.3 x 10-5 (7) Question 3 a) Calculate the solubility of MgF2 salt (Given: MMgF2 = 62.3 g.mol-') in (i) mol per litre water and (ii) gram per litre water by using the following data. (8) MgF2 (s) = Mg2+ (aq) + 2F (aq) Ksp = [Mg2+][F1 = 5.2 x 10-11 b) Calculate whether the BaSO4 will precipitate when you mix 100.0 mL of a 0.0200 M BaCl2 solution with a 0.0300 M Na2SO4 solution by using the following given data. (3) [Ba²+] after mixing = 0.0133 M [SO4) after mixing = 0.0100 M BaSO4 (8) Ba2+ (aq) + SO42- (aq) Ksp = [Ba2+][SO421 = 1.1 x 10-10