1. D

    Do following half-reactions have electrode potential that depends on pH?

    Do following half-reactions have electrode potential that depends on pH? I know H+ or OH- ions wouldn't be included in Nernst equation for these, but would pH affect chemical balance in these reactions, and therefore electrode potentials? Br2+2e- -> 2Br- Cl2+2e- -> 2Cl- I2+2e- -> 2I-...
  2. M

    Reduction potential of H2O2 = nonsense

    Hello, I've always been puzzled by H2O2 nominal reduction potential because it is not compatible with many reactions where H2O2 actually behaves as a reductant. Taking this as reference (there are more precise ones, but H2O2 is ranked as one of the highest in all tables anyways), the reduction...
  3. T

    Calculating potential of a solution

    Hi I'm having some trouble with the following problem: Calculate the potential of a solution made by mixing equal volumes of 0.20M thallium(I)nitrate and 0.20M dibromine in 1M HCl. E°'(Tl3+/Tl+) = 0.77V en E°'(Br2(aq)/2Br-) = 1.087V The answer given is 0.934V This is what I have so far...
  4. M

    electro potential

    is it any relation between the energy af activation and the energy of cell
  5. A

    Junction potential

    What is exactly junction potential? How salt bridge is helpful in reducing it?
  6. S

    How to cause a potential difference between two steel electrodes

    Hi, I am a civil engineering student currently starting a project on electro-kinetic remediation with no external power supply. I have two connected steel electrodes, one placed in copper sulphate solution and one placed in just water. They are placed either side of a clay sample spiked with...
  7. S

    standard cell potential

    I am using NiSO4 aqueous solution, Pt anode, Cu cathode coated with Au for Ni electroplating (at 3 V DC) on Au. Cu is not exposed to solution. To calculate cell potential should I consider Cu/Pt or Au/Pt. If I replace Pt with graphite, whether for same 3 V DC supply Ni plating would be...
  8. N

    Electrochemical potential

    I took some phosphate buffer saline(7.4) into a beaker, included a Au electrode and reference electrode (Ag/AgCl) and tried to measure the potential using multimeter. The temperature and pressure is assumable same. The multimeter shows the potential some milivolts but the potential is...
  9. N

    Calculating molarity using cell potential

    The potential of a cell is measured in which the anode half-cell is the standard hydrogen electrode and the cathode half-cell is a silver electrode in a solution containing silver ions: SHE || Ag+(x M) | Ag(s) Calculate the molarity of Ag+(aq) if the cell's potential is 0.546 V. I...
  10. M

    Changes in Potential and Kinetic Energy During Changes of State

    Im kinda confused about the change in kinetic and potential energy during changes of state. For example, when gas turns into liquid, kinetic energy stays constant, but why does potential energy decrease? Shouldn't it go up since the molecules are closer and tighter together? Also, when a liquid...
  11. C

    Cell Potential

    I feel like I'm really close. I'm using the Nernst equation. I have it set up as... Ecell=3.162- .0592/2 * log(K) Where do I put the molarities in the equilibrium? Calculate the cell potential of the following voltaic cell at 25 C. Mg|Mg+2 (1E-6 M)||Ag+(1E-2 M)|Ag Mg Ecell reduction= -2.363...