1. Estimate the solubility of calcium carbonate at 25C in the presence of 0.09MCaCl2(aq). 2. Will BaSO4 precipitate from a solution containing 1.5104MBa+2, barium ion, if enough sC salt, Na2SO4, is added to make the solution 2.5104MinSO42 ? 3. Describe oxidation reaction and use a rust of iron as an example. 4. Describe the formation of a char coal. Motivate your answer with chemical reactions. 5. List three possible disadvantages when a car owner replaces the manufacturer's recommended gasoline with methanol. 6. Consider a galvanic cell consisting of 5Fe2+(aq)+MnO4(aq)+8H+(aq)5Fe3+(aq)+Mn2+(aq)+4H2O(l) i) Write the oxidation and reduction half-reactions ii) Write the reaction using cell notation. iii) Which reaction occurs at the cathode? iv) Which reaction occurs at the anode? [6] 7. The solubility product of calcium fluoride (CaF2) is 3.451011. If 1.5mL of a 0.10M solution NaF is added to 130mL of a 1.0105M solution of Ca(NO3)2, will CaF2 precipitate? [5] 8. Represent the cell in which the following reaction takes place Mg(s)+2Ag+(0.001M)Mg2+(0.130M)+2Ag(s) Calculate its E((cu) if E(cal)=3.17v [5]