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Unformatted text preview: EXPER I MENT 6 - STANDARD ELECTRODE POTENT IALS AND SOLUB IL I TY - PRODUCT FROM POTENT IAL M EASURE MENTS Biomolecular Dynamics Report 3 By: Jonathon Nguyen (16323012) Question A 1. Draw a typical experimental ar rangement of a hydrogen electrode. 2. Briefly describe the origin of liquid junction potentials. How are liquid junction potentials avoided in practice? A liquid-junction potential is the extra potential difference generated across the interface of two electrolytes when they are in contact. A salt bridge is used to avoid the extra potential difference. 3. Using literature values of E Ag,AgCl and E Ag calculate Ksp for AgCl. You will need this value to compare with your experimental value. E Ag,AgCl = +0.22v E Ag = +0.80v E Ag,AgCl- E Ag = RT/F ln K sp 0.22 – 0.80 = 25.693x10-3 ln K sp K sp = 1.6x10-10 Aim: • to obtain the standard electron potential values of copper, zinc and silver • to obtain the solubility product of silver chloride by setting up a variety of electrochemical cells and measuring their EMF Theory: An electrochemical cell is a device in which the free energy change accompanying a spontaneous chemical reaction is made....
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- Spring '10
- Electrochemistry, standard electrode, E Ag, RT/F ln