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1- Order the following from the strongest to the weakest acid. HC1O2, H2O, NH4+, HC104 9 2- Values of Kw as a function of temperature are as follows: Temperature Kw (°C) 0 1.14x10-15 25 1.00×10-14 35 2.09x10-14 40 2.92x10-14 50 5.47x10-14 a. Is the autoionization of water exothermic or endothermic? b. Calculate [H+] and [OH-] in a neutral solution at 50 °C. 3- The pOH of a sample of baking soda dissolved in water is 5.74 at 25°C. Calculate the pH, [H+], and [OH-] for this sample. Is the solution acidic or basic? 4- A solution is prepared by adding 50.0 mL of 0.050 M HBr to 150.0 mL of 0.10 M HI. Calculate [H+] and the pH of this solution. HBr and HI are both considered strong acids. 5- A solution of formic acid (HCOOH, Ka= 1.8 x10-5) has a pH of 2.70. Calculate the initial concentration of formic acid in this solution.

6- Calculate the mass of HONH2 required to dissolve in enough water to make 250.0 mL of solution having a pH of 10.00 (K6 = 1.1 *10-8). Determine [OH-], [H+], and the pH of each of the following solutions. a. 1.0 M KC1 b. 1.0 M KC2H3O2 V 8- Will the following oxides give acidic, basic, or neutral solutions when dissolved in water? Write reactions to justify your answers. a. CaO b. SO2 c. C120 V 9- Identify the Lewis acid and the Lewis base in each of the following reactions. a) B(OH)3 (aq) + H20 (1) +B(OH)4 (aq) + H+(aq) b) Ag+ (aq) + 2NH3 (aq) + Ag(NH3)2+ (aq)