What was the initial color of the mixture in Well C-1? What color change do you
ID: 511402 • Letter: W
Question
What was the initial color of the mixture in Well C-1? What color change do you observe when you add H_2O to the mixture m Well C-1? What color change do you observe when you add concentrated HCl to the mixture in Well C-1? What color charge do you observe when you add 0.1 M Ag NO_3 solution to the mature in Well C-1? What color change do you observe when you add H_2O to the mixture in Well C-2? What color change do you observe when you add ethyl alcohol to the mixture in Well C-2? What color change do you observe when you add H_2O to the mixture in Well C-3? What color change do you observe when you heat the mixture from Well C-2? What color charge do you observe wren you cool the warm mixture from Well C-2? Write the net ionic equator for the equilibrium involving the hexaaquocobalt(II) ion in this experiment. Predict the direction in which the equilibrium should shift when you add H_2O to the mixture in Well C-1. Briefly explain. Briefly explain how your observatExplanation / Answer
Equilibrium study for [Co(H2O)6]2+ complex
(30) Initial color is pink
(31) when water is added, color becomes light pink
(32) when HCl is added, according to LeChatellier's principle, incresed Cl- in solution shifts the equilibrium to [CoCl4]2- formation and color becomes blue,
(33) when AgNO3 is added, it reacts with Cl- and thus reduced Cl- concentration in solution shifts equilibrium to the right and solution becomes pink color
(34) when H2O is added to C-2, solution becomes dilute and color becomes pink
(35) when ethyl alcohol is added, no change is observed
(36) when water is added, reaction turns pink again
(37) when heated it turns blue as forward reaction is endothermic
(38) cooling the reaction mixture gives back pink due to formation of [Co)H2O)6]2+ again
(39) net reaction,
[Co(H2O)6]2+ (pink) + 4Cl- <==> [CoCl4]2- (blue) + 6H2O
(40) adding water shifts equilibrium to the left and color becomes pink
(41) change in color to pink supports the theory
(42) concentrated HCl addition, shifts equilibrium to the right (blue color)
(43) The change in solor supports this theory
(44) AgNO3 When added, forms AgCl, reduces Cl- in solution and equilibrium shifts to pink on the left side.
(45) formation of pink color, supports this theory.
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