What does it mean for a chemical reaction to be at equilibrium? In part 2 of thi

Question

What does it mean for a chemical reaction to be at equilibrium? In part 2 of this experiment, you used the indicator methyl orange. Why was this indicator chosen instead of phenolphthalein? Why is phenolphthalein not an appropriate indicator for this equilibrium? Considering part 4C in this experiment give two other ions that could be added besides hydroxide that you might expect to have the same effect. The lab manual mentions that ammonium hydroxide is more property called aqueous ammonia. Based on this, is NH_3 likely a strong base or a weak base? Would you predict the following equation to have a large or small Keq value? NH_3 (aq) + H_2 O (l) NH4^+ (aq) + OH^- (aq)

Explanation / Answer

Q1.

A chemicla reaction is to be in equilibrium when the rate of reaction in th eforward direction is the same as the reverse rate.

Therefore, there is no longer more products/reactants being converted.

This means that the reaction has already "ended"

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