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12 Dec 2019

Chemical Equilibrium - Pre-lab quiz. Please help.

1. How will you be able to tell which way the equilibrium is shifting in the Cr₂O₇^2-/CrO₄^2- equilibrium system?

2. According to Le Chatelierâs Principle, which way will an equilibrium shift (left or right) when heat is added if the reaction in the forward direction is exothermic?

3. In an undisturbed equilibrium system, why do the concentrations of the products and reactants remain constant?

4. In an equilibrium system involving Co(H_2/O)₆²⁺ and NCS^-, how will you decrease the concentration of NCS^- in the mixture?

5. What should you do with the leftover reagents at the end of the experiment?

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Related questions

Le chatelierâs principle pre lab

1 Part A.

Consider the following equilibrium between oxygenated heme (HbO2) in blood and heme complexed with carbon monoxide (HbCO). As dissolved carbon monoxide levels in a patients blood increase, what happens to the levels of each of the three other substances? (do they increase, decrease, or remain unchanged?)

HbO2 (aq) + CO (aq) ? HbCO (aq) + O2 (aq)

(a) HbCO (aq) (b) O2 (aq) (c) HbO2 (aq)

Part B

Consider the following system at equilibrium. At 25?C the equilibrium constant (Keq) is 10.5 M-1. Le Chatelierâs principle states the equilibrium constant will not change if you add more material, but the mass in solution will shift to products or reactants to relieve the disturbance and produce new equilibrium concentrations

A (aq) + B (aq) ? AB (aq)

1. Write the forward and reverse equilibrium expressions for this following reaction.

2. If you add A to the system, would equilibrium shift (more mass moving towards) products or reactants?

2 . Consider the following equilibrium system. Predict whether equilibrium would shift towards reactants or products if each of the following were added to the system.

CaCO3 (s) + CO2 (g) + H2O (l) ? Ca2+ (aq) + 2 HCO3- (aq)

(a) A catalyst (b) CaCO3 (s) (c) CaCl2 (aq) (d) CO2 (g)

pinkkangaroo494

Any help/explanations with this Le Chatelier's Principle lab would be extremely helpful. I attemtped to do question A, but I'm not exactly sure if my answer is interpreted correctly. I have included the actual lab procedure with the 5 questions. Thank you again.