Calculate the equilibrium constant for the reaction below given that the concentrations of reacting species at equilibrium are (Cl2] = 0.11 M, [H2] = 0.15 M, and (HCl) = 0.95 M.
Cl2(g) + H2(g) → 2 HCl(g)

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According to arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. further, acid and base reacts to form salt and water.consider following example.hcl    +      h2o          →      cl-          +      h3o+here, hcl has donated a proton, hence it is an acid.now consider following reactionhcl      +      naoh            ↔      nacl      +        h2oin this reaction, hcl donates proton, hence it is acid. on other hand, naoh donates hydroxyl ion (i.e. hence it is a base.   

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