Cobalt Complex Ion Equilibrium - LeChatelier's Principle Lab Part 3 | North Carolina School of Science and Mathematics | YouTubeToText
YouTube Transcript: Cobalt Complex Ion Equilibrium - LeChatelier's Principle Lab Part 3
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we'll now look at the equilibrium
between a Cobalt water complex ion which
is pink and a cobalt chloride complex
ion which is blue we'll start with two
test tubes with the Cobalt water complex
ion we add 12 M hydrochloric acid to one
of the tubes we notice that the solution
turns blue this indicates that the
equilibrium has shifted in the reverse
Direction the hydrochloric acid provides
a source of chloride ion as we increase
the concentration of the product the
equilibrium shifts in the reverse
direction to use up the added chloride
tube we notice that the solution has
turned back to Pink by adding water to
the solution we've shifted the
Direction we'll start with two tests
tubes with the Cobalt water complex ion
we add 12 M hydrochloric acid to one of
the tubes we notice that the solution
turns blue this indicates that the
equilibrium has shifted in the reverse
Direction the hydrochloric acid provides
a source of chloride ion as we increase
the concentration of the product the
equilibrium shifts in the reverse
direction to use up the added chloride
ion we will now add some silver nitrate
solution to the Cobalt chloride complex
ion we notice the formation of a white
solid which is the silver
chloride we also notice that the
solution is turned from Blue to Pink the
silver ion removes chloride ion from
solution as solid silver chloride the
equilibrium shifts in the forward
direction to try and replace the
chloride ion that's been
removed we're going to take a test tube
containing the equilibrium mixture the
solution is Pink
indicating that we have a high
concentration of the Cobalt water
complex ion we're going to put this into
a warm water
bath as we warm the solution the
solution turns from being pink to blue
if you heat an equilibrium mixture the
equilibrium will shift in the
endothermic Direction This is an
indication that that this reaction is
endothermic in the reverse Direction
cooling a reaction mixture shifts the
equilibrium in the exothermic
direction we notice that as we cool this
the solution goes from being blue to
Pink indicating that the reaction is
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