Make a sketch of an electrolysis cell that electroplates nickel onto other metal surfaces. Label the anode and the cathode and indicate the reactions that occur at each.
Note Set #8 – week 10 Analytical Chemistry VOLTAMMETRY Cyclic Voltammetry – a variable voltage is applied to a chemical cell system over a period of time, increasing from 0 to about 800 mV, then back to 0 o Depending on how quickly the electrochemical reaction is able to occur, the rate at which one “scans” the voltage up and down differs; if the rxn is slow, the voltage scan must be slower o The effects of a cyclic voltammagram are graphed with a duck curve the duck curve maps the voltage applied vs. the resultant current in the system Analyzing the duck curve of a voltammagram o The min and max peaks of the curve show the greatest current, which denotes the point at which an oxidation or reduction is occurring at the greatest rate. o NOTE – the peaks will then taper out to a limiting amperage, and the curve approaches this level asymptotically. This current is called the diffusion limited current; diffusion limits how fast molecules can approach the surface of the working electrode in the system to be either red’d or oxi’d The voltage halfway between the two peaks of the curve marks the reduction potential of the species being analyzed in the cell system Over potential o Over potential: is the kinetic barrier that must be overcome using enough voltage to make an electrochemical rxn occur. Denoted Greek letter eta (η)