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Equilibrium Lab - Restoring Balance. The solubility of iodine increases because the position of equilibrium has shifted towards the triiodide side of the reaction. Addition of the reactants causes an increase in the product which is directly related t

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Introduction

Leo Tran IB Chemistry SL II R5 Ms. Crane January 4, 2012 Restoring Balance LAB Pre-Lab Questions 1. The solubility of iodine increases because the position of equilibrium has shifted towards the triiodide side of the reaction. Addition of the reactants causes an increase in the product which is directly related to the solubility of iodine in water in this case. 2. Ammonium chloride will be more soluble in hot water as in an endothermic reaction, increasing the temperature (which is the same as adding heat - one of the reactants) will cause the position of equilibrium to shift towards the products to compensate for the change. ...read more.

Middle

(b) Cl- ion (c) When the stress (Chlorine from hydrochloric acid and calcium chloride) is added on the reactant side (more reactants), the pink color reduces and blue color increases. In other words, CoCl42- is favored to compensate for the change or minimize the stress. 4. A. Adding a species which appears on the right side of an equation will shift the equilibrium to the left side of the equation. B. Adding a species which appears on the left side of an equation will shift the equilibrium to the right side of the equation. 5. Since acetone attracts water molecules (decrease water molecules from the reaction) the reaction tries to create more water. ...read more.

Conclusion

8. When the solution was heated, CoCl42- ion (blue in color) was favored as the whole solution became dark blue. Co(H2O)62+ ion (pink in color) was favored when the solution was cooled as the whole solution became light pink in color. Heat + Co(H2O)62+ + 4Cl- --> CoCl42- + 6H2O 9. Since Equation 5 is endothermic, heat is required for the reaction to proceed, and increasing the temperature (adding heat) will cause the position of the equilibrium to shift towards the products (CoCl42- side) resulting in a pink color of the whole solution. Cooling the solution (taking away the heat) shifts the position of the equilibrium towards the reactants (Co(H2O)62+ side) resulting in a pink color of the whole solution. ?? ?? ?? ?? ...read more.

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