Question

q7

Using the activity series, predict whether a reaction occurs or no reaction occurs for each of the following single-replacement reactions: a) Cu(NO3)2(aq) + Ni(s) - [Select] b) Au(s) + H2SO4(aq) — [ Select] c) FeSO4(aq) + Ag(s) – [Select

Answer 1

In displacement reaction, more active metal displaces the less active metal from its salt solution. so the metal with more negative reduction potential can displace the metal with less negative / positive reduction potential. For a vall reaction to be feasible, Ell should be true Ecell = E(Cathode, - E anode. At cathode reduction takes place and at anode oxidation takes place a) Cu No aq + Nics) - Ni (NB) coat can Reaction takes place because activity of Niy cu Anode on Nice Niztegit at = – 0.23v de rxn. Cu aqst aê cus) - 0.34v. Ecell = 0.34 - 0.23v = 0.57 As the Ecell val tve reaction occurs. b) Aucs + HSO Cas No reaction. Auch Aust +30 ; Anode sxn, E = + 1.40v. Cathode ran; 2H+ +2è ha; E =0.oov. E cell = (O.OOV - 1.40V) = -1.40V. Reaction does not occur, as Ecell is ove. I Feso caq) + Ag cs No ben al value S Anode xxn: Agcs, Agr t ė; - 0.80v. cathode ron: Felt + Fels. E' = – 0.44v. Ecell = -0.44 -0.80V = -0.36V; No reaction.