Question

Please help me with questions 3-5

You are expected to come to lab with these questions answered They will be taken up at the beginning of the lab period in which you perform this experiment. 1. The lab report gives you the net ionic equation rather than the molecular equation for the clock reaction. Were there any spectator ions present when you ran your reactions, if so what were they? 2. The two ions that react in this experiment are iodide) and S20s: (persulfate). How many moles of each are present in the first reaction mixture which you make (Experiment lin Table 16.1? What is the total volume of the solution these two ions are in initially (immediately after mixing but before any reaction has occurred)? 3. Explain briefly how the thiosulfatestarch indicator system works in this experiment. 4. In each reaction, the color changes when all the S203 (thiosulfate)isused up. How many moles of thiosulfate are placed in each reaction mixture? How many moles of I and S20s2 have been used up when the thiosulfate is gone? You will need to use the stoichiometry of the clock reaction and ofthe thiosulfate reaction to do this calculation. 5. If the blue color appears in an experiment after 92 seconds, what is the rate of the reaction in Msec or mol L-1 si?

Answer 1