NaOH is added to the system. The solution changes from pink to a dark pink/red.
ID: 510115 • Letter: N
Question
NaOH is added to the system.
The solution changes from pink to a dark pink/red.
HCl is added to the system.
The solution changes from pink to clear.
NH4Cl is added to the system.
The solution changes from pink to clear.
1. Predict what would happen if the ammonium system described in the experiment was heated.ammonium system: heat + NH4+ + OH- NH3 + H2O
(in the experiment, there was a note that read: the purplish color is due to phenolphthalein. The darker the purple color, the larger the hydroxide ion concentration in solution.) I had to add the following chemicals to the reaction and beside is the results of the chemicals. Now the question is asking me, what would happen if i added heat to the ammonium system? What would be the result?NaOH is added to the system.
The solution changes from pink to a dark pink/red.
HCl is added to the system.
The solution changes from pink to clear.
NH4Cl is added to the system.
The solution changes from pink to clear.
Explanation / Answer
Ans. Le Chatelier’s principle states “if a dynamic equilibrium is disturbed by changing the conditions (Concentration, Volume, Pressure, temperature, etc.), the position of equilibrium shifts to counteract the change to reestablish an equilibrium”.
Reaction: Heat + NH4+ + OH- <---------> NH3 + H2O
Note that “heat” is written on the left side of equilibrium. That is, adding heat to the system favors the forward reaction or favors the formation of NH3 and H2O.
As observed in the reaction, progression of the reaction in forward direction (to the right) reduces [OH-] by forming H2O. Thus, reduction of [OH-] will further fade (reduce the intensity) of the pink color.
That is, solution changes from pink to clear.
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