Given the following equilibrium system, what will be the affect of adding the fo
ID: 1029068 • Letter: G
Question
Given the following equilibrium system, what will be the affect of adding the following components?
To detect the affect of the stress the following indicator was used Bromcresol Green Acid Color(yellow) Base Color(blue)
PART A: Study of the Weak-Acid Equilibrium:
NH4+(aq) (Blue) + H2O(l) <green> NH3(aq) (yellow) + H3O+(aq)
1)When adding ammonium chloride solution, the color of the equilibrium mixture changed from Green -> Yellow
_____ a. The color change indicated a shift in the point of equilibrium. In which direction did the equilibrium shift? (L) left (R) right
b. Explain your answer to question 1a. You should indicate which ion was added to or removed from the equilibrium mixture.
2. When adding hydrochloric acid solution, the color of the equilibrium mixture changed from Green -> Blue
_____ a. The color change indicated a shift in the point of equilibrium. In which direction did the equilibrium shift? (L) left (R) right
b. Explain your answer to question 2a. You should indicate which ion was added to or removed from the equilibrium mixture.
3. When adding sodium hydroxide solution, the color of the equilibrium mixture changed from Green -> Yellow
_____ a. The color change indicated a shift in the point of equilibrium. In which direction did the equilibrium shift? (L) left (R) right
b. Explain your answer to question 3a. You should indicate which ion was added to or removed from the equilibrium mixture.
Explanation / Answer
Answer 1a) Equilibrium shifted in right direction.
Answer 1b) Equilibrium shifted in right direction because when Ammonium Chloride was added to the solution then NH4+ ions were added so accordind to Le Chatelier’s principle, adding additional reactant will shift the equilibrium to the right.
Answer 2a) Equillibrium shift to the left.
Answer 2b) Adding HCl to the solution increases the H+ (H3O+) ion concentration
Answer 3a) Equillibrium reaction to the right.
Answer 3b) NaOH reacts with H3O+ to form Na+ and H2O .This reduces the H3O+ concentration and shifts equillibrium to the right.
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