Posted: September 13th, 2017

The Daniel Cell

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The$Daniel$Cell Michael(W.(Burand,(Chris(Knutson,(Oregon(State(University(Department(of( Chemistry Adapted’from’a’laboratory’activity’by’members’of’the’Department’of’Chemistry,’Oregon’State’University Introduction This!experiment!deals!with!cells!in!which!spontaneous!oxidation 4 reduction!reactions!can!be!used!to! produce!electrical!current!flow.!The!reactants!in!the!oxidation 4 reduction!reaction!are!physically! separated!from!one!another!so!there!cannot!be!a!direct!transfer!of!electrons!from!one!reactant!to!the! other.!Instead,!the!two!reactants!are!joined!by!a!wire!through!which!electrons!travel!from!one!reactant! to!the!other.!This!flow!of!electrons!through!the!wire!constitutes!an!electric!current.!This!is!the!difference! between!voltaic!(galvanic)!and!electrolytic!cells:!in!voltaic!cells!the!electrons!flow!spontaneously!from! one!reactant!to!the!other!because!the!reaction!is! thermo-dynamically!spontaneous.!In!an!electrolytic!cell! a!non4spontaneou ! reaction!is!forced!to!occur!by!the!application!of!an!outside!power!supply!(a!battery)! ǁŚŝĐŚ͞ƉƵŵƉƐ͟ĞůĞĐƚƌŽŶƐƚŚƌŽƵŐŚƚŚĞĐĞůů͘ Figure’5:’A’CuʹZn’voltaic’cell. The!preceding!figure!shows!a!voltaic!cell!in!which!Cu2+ is!reduced!by!Zn!metal;!the!cell!reaction!is: Cu2+(aq)!+!Zn0 (sͿїƵ0 (s)!+!Zn2+(aq) (Note!that!for! electrochemical! reactions,!the!superscript!0!is!often!added!to!emphasize!that!the!species! is!not!charged.)!This!cell!consists!of: