DATA The Effect of Concentration 1. Record the color of each solution at each st
ID: 229159 • Letter: D
Question
DATA The Effect of Concentration 1. Record the color of each solution at each step Test Tube # | Test Tube # | Test Tube Test Tube # 3 Initial Color CrO2 and Species Green/Yellow Orange Cr20,2. CrO 2. Cr20,2. Green/Yellow Orange Color and CrO,2 Species after 5 drops of HCI Cr20,2. NA NA HCL Light Orange Orange Color and Species after 5 drops of NaOH NA NA CrO42 Cr20,2 NaOII NaOH No Change Yellow Color and Cro NA NA NA Species after 10 drops of NaOH HCL NaOH Yellow Color and NA Species after 10 drops of HCl NA CrO.2 NA NaOll ICL Light OrangeExplanation / Answer
2. In the solution 1 temperature increases. As exothermic reactions releases heat, thus accompanied by increase in temperature. Solution 2 is endothermic as it involves decrease in temperature which means heat is used up to proceed the reaction.
5. HCl contains H+ and Cl- ions. The presence of Cl- ions in the solution will affect the equilibrium of CoCl2 due to common ion effect. As we can see in test tube 1&2, due to presence of Cl- ions, the colour is purple or blue due to increased presence of Cl- ions. However in test tube 3 it is absent, thus colour is vastly different.
6. Both CaCl2 and CoCl2 have 2 Cl- ions in equilibrium. Thus it leads to increased concentration of Cl-. Thus colour changes to dark blue or purple.
7. AgNO3 contains Ag+ and NO3- ions. Thus obviously the presence of Ag+ will affect equilibrium as it will consume more and more Cl- from the solution. Thus the blue color of the solution changes to pink color.
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