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

13. calculate the initial concentration (before precipitation) of carbonate ions after the addition of each 0.05 ml of solution b to the 1.00 l beaker of solution a. divide the work among group members and write the answers in the table in model 3. assume the volume change as solution b is added is negligible. 14. notice the initial concentrations of zn2+ - and cu2+ in the table in model 3. a. explain how these were obtained from the data in model 2. b. as solution b is added and precipitates form, do these initial concentrations change? 15. use the data in model 2 to indicate the presence of precipitate (either znco3 or cuco3) after each 0.05 ml addition of solution b in model 3. 16. use the initial concentrations of carbonate ions and zinc ions to calculate the reaction quotient, qsp for the zinc carbonate scenarios in model 3. divide the work among group members and write the answers in the table in model 3. 17. use the initial concentrations of carbonate ion and copper(ii) ions to calculate the qsp for the copper(ii) carbonate scenarios in model 3. divide the work among group members and write the answers in the table in model 3.

What is avogadro’s number, and why is it useful

Write a balanced equation showing the formation of copper (ii) nitrite from its elements