2: Introducing Equilbrium e chemical equation for the dissopía- II. Studying the
ID: 1041374 • Letter: 2
Question
2: Introducing Equilbrium e chemical equation for the dissopía- II. Studying the [CoclIonCo(H20w H in water. lon Equillbrium (17) What ls the color of the solution (Step 12)7 If any, experimental evidence do you uililbrium is aflected by the addition of la (Step 7)? Briefly expla (18) What changes do you observe when you add concentrated HCI (Step 13)? blve (19) What change do you observe when you add distilled water (Step 14)1? Plt r observationand explanation in (13) ? Brietly explain. (20) Write the net ionic equation for the [CoCl ion Co(H2Oe lon equilibrium do you have that the equlilbrium is affected by the addition of (21) What, If any, experimental concentrated HCI? Briefty explain. evidence do you any brium is affected by the addition of p 8)? Briefly explan. (22) Are your observation and explanation in (21) consistent with Le Châtelier's principle? Briefly explain. servation and explanation in 5 telier's principle? Briefly explain.Explanation / Answer
III) The equilibrium reaction is given as
[CoCl42-] (aq) + 6 H2O (l) <======> [Co(H2O)6]2+ (aq) + 4 Cl- (aq)
K = [Co(H2O)62+][Cl-]4/[CoCl42-] ……(1)
17) The initial color of the solution, which contains only [CoCl4]2- is blue.
18) Concentrated HCl ionizes in an aqueous solution to produce Cl- as
HCl (aq) -------> H+ (aq) + Cl- (aq)
When HCl is added to the above equilibrium, the color of the solution changes to blue.
19) When distilled water (H2O) is added to the solution, the solution changes color to pink.
20) The ionic equation for the reaction is shown above.
21) The experimental evidence is the change in color of the solution from light pink to blue.
22) The observations are consistent with the Le-Chatilier principle. When HCl is added to the solution, [Cl-] increases. However, K must remain constant since the temperature of the reaction is constant. To keep K constant, [Co(H2O)62+] must decrease. This is possible only when the reverse reaction is favored, i.e, the pink colored [Co(H2O)6]2+ produces blue colored [CoCl4]2-.
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