Experiment 18 PreLab (Snyder, Sarah R).docx

Experiment 18 PreLab (Snyder, Sarah R).docx - Introduction...

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Introduction to Organic Chemistry Experiment 18 Sarah Snyder Part 1: Le Chatelier’s Principle Objective: The objective of this experiment is to use Le Chatelier’s Principle to predict what will happen when an acid and a base are added to the soluble hydroxide and then test this hypothesis to see if this principle successfully predicts the solubility of insoluble hydroxides. Hypothesis: Le Chatelier’s principle states that when a chemical system at equilibrium is disturbed, the system will shift in the direction that minimizes the disturbance. In the fictional equilibrium reaction, A + B ↔ AB, if more A is added then the reaction will shift toward the forward direction to minimize the disturbance and use up the newly added A. Similarly, if more AB is added then the reaction will shift to the reverse direction to remove access AB. Lastly, if B was removed, the reaction would shift in the reverse direction to generate more B to compensate for the removal of B. Methyl Violet (MV) is a pH indicator that changes colors around a pH of 1.6. In higher pH solutions it has a violet color and in lower pH solutions it has a yellow color. The reversible reaction of methyl violet is expressed as: H + (aq) + MV - (aq) ↔ HMV(aq). When methyl violet is mixed in water it will have a purple color indicating that there is much more MV - present than HMV. When an acid is added, it increases the amount of H + present causing the reaction to shift to the right to form more HMV and remove access H + . If enough acid is added, almost all the MV - will be used up to compensate for the extra H + . Therefore, the mixture will contain almost all HMV and will appear yellow. If a base is added to this yellow solution
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