Data Sheet L Studying the CrO lon/Cr20 lon Equilibrium (1) What is the color of
ID: 578604 • Letter: D
Question
Data Sheet L Studying the CrO lon/Cr20 lon Equilibrium (1) What is the color of the solution in Step 1? (2) What change do you observe when you add H,SO, solution (Step 2) (3) What change do you observe when you add NaOH solution (Step 3)? (4) Write the net ionic equation for the Cro,2-ion/CrO ion equilibrium. Whs, if any eperimental evidence do yuhave that the equilbrium is afleted by the addition of H SO, solution? Briefly explain. (6) Are your observation and explanation in (5) consistent with Le Châtelier's principle? Briefly explairn. What, if any, experimental gvidence do you have that the equilibrium is affected by the addition of NaOH solution? Briefly explain. (7) (8) Are your observation and explanation in (7) consistent with Le Châtelier's principle? Briefly explain. 49Explanation / Answer
2CrO4-2 + 2H+ = CrO7-2 = H2O
Q1.
CrO4-2 = yellow
Cr2O7-2 = orange
Q2
if we add H2SO4, then
H+ + CrO4-2 = HCrO4- forms
then, yellow decreases, orange increases
Q3
2CrO4-2 + 2H+ = Cr2O7-2 + H2O
if we add OH- then, Cr2O7-2 must form even more CrO4-2
since 2H+ decreases, then more CrO4-2 must be formed
Q4
in equilbirium, net ionic:
2CrO4-2(aq) + 2H+(aq) = CrO7-2(aq) + H2O(l)
Q5
color change is the proof of equilbiriumc hange
Q6
Yes they are, since counterbalance must be done, recall that
First, let us state the Le Chatelier principle which deals with changes in an equilibrium:
The statement is as follows:
If any equilibrium is disturbed, that is, change in conditions such as P,T, concentration, partial pressure, etc.., the system will counterbalance such change in order to favour the system's equilbirium.
Q7
color change in NaOh addition states that more yellow and less orange is produced
Q8
Yes they are, as stated in 6
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