Data Sheet L Studying the CrO lon/Cr20 lon Equilibrium (1) What is the color of

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. 49

Explanation / 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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