Please explain how to do these and show the steps you took. 5. Given that an aqu
ID: 941005 • Letter: P
Question
Please explain how to do these and show the steps you took.
5. Given that an aqueous solution of Co(H20)% is pink and an aqueous solution of Co(NH) is blue, answer the following questions about an equilibrium system involving these cobalt (II) ions. (Refer to Burdge pages 681-687 and the Le Châtelier's Principle addendum at the end of this lab for more information about how to approach this question.) (pink) (blue) a. Assume that you start with a solution of only Co(H20)% (aq). What color would you observe initially. What color is this solution absorbing (think about the color wheel for this one)? b. Assume there is a reasonable amount of both Co(H2O) (aq) and Co(NH3) (aq) in the equilibrium mixture. Predict what you should observe as the solution in (a) reaches equilibrium c. Predict what you should observe when excess NH3(aq) is added to the equilbrium solution. d. Explain why you made the prediction using concepts from Le Châtelier's principle e. Write the chemical formula of the substance that increased in amount as a result of adding NH3(aq) to the Co(H20)% solution. Write the formula of the substance that decreased in amount.Explanation / Answer
a) Initially, we will observe Pink colour. The colour which is absorbed is light green.
b) The solution will become purple in colour.
c) When excess NH3 is added, the equilibrium will shift towards right according to Le Chatelier's principle.
d) Le Châtelier's principle can be used to predict the effect of a change in conditions on a chemical equilibrium. The principle is named after Henri Louis Le Châtelier. Le Châtelier's Principle can be summarised thus:
If a chemical system at equilibrium experiences a change in concentration, temperature, or total pressure, the equilibrium will shift in order to minimise that change.
The principle is used by chemists in order to manipulate the outcomes of reversible reactions, often to increase the yield of reactions.
e) Substance increased = Co(NH3)62+
Substance decreased = Co(H2O)62+