1. Molten magnesium chloride is electrolyzed with a current of 12.5 A for 40 minutes. Calculate the volume (at 25 ° C and 1 atm) of chlorine that forms at the anode of the electrolytic cell. Also calculate the mass of aluminum that is deposited at the cathode of an electrolytic cell containing its salt in the molten state, when the same current is passed through the cell for 1.5 hours. 2. The boiling temperature of a cobalt (II) chloride solution is 100.5 ° C. Her density at 25 ° C is 1.235g / cm3 . Calculate the osmotic pressure of the solution at 25 ° C. [Keb = 0.515] 3. Calculate the volume of water needed to solubilize 0.05 g of cadmium hydroxide. [Kps = 5.27x10-15] 4. At 2.50 dm3 24.0 cm3 of an ammonia solution of pH = 10.85 are added 7.50% w / w hydrochloric acid solution (d = 1.015 g / cm3 ). Calculate the pH of the solution resulting. [Kb = 1.85x10-5] 5. An aqueous solution of the sodium salt of a monoprotic weak acid has pH = 10.20. Calculate the volume of gaseous hydrochloric acid (measured at c. n.) necessary to buffer a pH = 7.5 150.0 cm3 of the initial solution. [Ka HA = 1.5x10-7