Daniell Cell

Work Experience Project Daniell Cell

Made Made By: By: Sharad Raghav Class X!"

Daniell Cell #ith Constr$ction and Working Daniell cell is the si%plest voltaic or galvanic cell& t converts che%ical energy into electrical energy spontaneo$sly&

Constr$ction: Daniell cell consists o' t#o hal'!cells& (ne hal'!cell is )inc rod dipped in *M +nS(, sol$tion& -he other hal'!cell is copper rod dipped in a sol$tion o' *M C$S( ,& " poro$s partition or a salt .ridge separates the t#o hal'!cells 'ro% each other& -he t#o electrodes are connected together externally .y a %etal #ire thro$gh a volt%eter are prod$ced here so anode is the negative electrode& -he copper rod acts as cathode #here red$ction takes place& Electrons are here so cathode is the positive electrode&

Working:  -he hal' reactions can .e vie#ed as a co%petition .et#een t#o kinds o' %etal ato%s 'or electrons& n this case )inc ato%s are %ore reactive and their tendency to lose electrons is greater than that o' copper& Both the reactions take place si%$ltaneo$sly at .oth the hal'!cell s& n this cell/ electrons travel in the external circ$it thro$gh the #ire 'ro% the )inc anode to the copper cathode& ' a .$l. is in the circ$it/ it #ill light $p& ' there is a volt%eter/ it #ill sho# the voltage& -o co%plete the circ$it/ .oth the positive and negative ions %ove thro$gh the a0$eo$s sol$tions via the salt .ridge& n this process/ +n electrode dissolves in the sol$tion o' +nS(, and red$ces in si)e #hile C$ electrode gro#s in si)e d$e to the deposition o' copper %etal& Daniell cell generates an electric

potential o' *&*1 volt/ #hen the sol$tions in the hal' cells are .oth *M&

"M:  -o st$dy the variation o' cell potential in +n2+n 3422C$342C$ cell #ith change in concentration o' electrolytes 5C$S(, and +nS(,6 at roo% te%perat$re&  -7E(R8 Red$ction potential o' an electrode increases #ith increase in concentration o' the electrolyte& Mn4 5a06 4 ne! !!!!!!!!!!!!!!!!!!!!!!9 M5s6 n the )inc!copper electroche%ical cell )inc electrode acts as anode #hile copper electrode acts as cathode& Ecell Ecathode ! Eanode Ecell increases i' E cathode increases and E anode decreases& -h$s/ $sing higher concentration o' C$ 34 and lo#er concentration o' +n 34 ions increase the Ecell o' +n2+n3422C$342C$ &  -he relation .et#een concentration o' the electrolyte and the standard electrode potential is given in the 'or% o' the ;ernst E0$ation: EE1 ! 1&1n log ?M@>?Mn4@ "PP"R"-AS ";D C7EMC"S * .eaker/ a poro$s pot/ connecting #ires/ %illi volt%eter/ sand paper/ )inc strip/ copper strip/ *M +nS( , sol$tion and *M C$S( , sol$tion& (BSER"-(;S: Conc. of ZnSO 4 solution

Conc. of CuSO 4 solution

EMF of the Cell

1M

1M

1.064V

1M

0.5M

1.057V

1M

0.025M

1.040V

1M

0.0125M

1.016V

0.5M

1M

1.071V

0.025M

1M

1.072V

o.0125M

1M

1.073V

C(;CAS(;: EM o' the cell increases #ith decrease in concentration o' the electrolyte aro$nd anode and increase in concentration o' the electrolyte aro$nd the cathode&