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The chemical reaction [Zn(OH)2(s) ←→ Zn2+(aq) + 2OH- (aq) 1. Why did you add 1M HCl...

The chemical reaction

[Zn(OH)2(s) ←→ Zn2+(aq) + 2OH- (aq)

1. Why did you add 1M HCl solution to your test tube? Using LeChateliers principle explain how the NaOH shifted the equilibrium between [Zn(OH)2(s) and Zn2+(aq) + 2OH- (aq). Explain how thr equilibrium system responded to counteract the change.

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Answer #1

1) The addition of 1M HCl will decreases the concentration of [OH-] in the reaction by forming moles of H2O, leading to the value of Qc<Kc, in order to reach the same value of Kc, the reaction will move in the forward direction (i.e. products concentration will increase and the reaction concentration will decrease in the reaction)

The equilibrium will counteract the change by establishing the reaction in forward direction, which will lead to the increase in the concentration of Zn(+2) and OH- and reduction in the concentration of Zn(OH)2

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