electrode potentials

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  • electrode potentials
    • standard electrode potential: the electrode potential of a half cell when measured against a standard hydrogen electrode.
      • if this value is NEGATIVE the half cell DONATES ELECTRONS to the standord hydrogen electrode
      • if this value is POSITIVE the half cell RECIEVES ELECTRONS from the standard hydrogen electrode
    • in the standard hydrogen electrode, hydrogen gas is introduced at the top of the PLATINUM electrode and bubbles out of the bottom, through the ONE MOLAR solution of HYDROGEN IONS (h+)
      • standard electrode potential: the electrode potential of a half cell when measured against a standard hydrogen electrode.
        • if this value is NEGATIVE the half cell DONATES ELECTRONS to the standord hydrogen electrode
        • if this value is POSITIVE the half cell RECIEVES ELECTRONS from the standard hydrogen electrode
    • the role of the platinum electrode
      • ensures good contact between hydrogen gas and hydrogen ion soln
      • allows reactions to occur quickly
      • it is inert so does not take part in the reaction
    • electrons move from positive to negative
    • dont forget to balance electrons!
    • if resulting voltage is POSITIVE, the reaction will occur, if the reaction is NEGATIVE, the reaction will not occur.
    • increasing conc of substance on LEFT side of half equation will make the voltage MORE POSITIVE (less negative)
      • increasing the conc of the substance on the RIGHT side of the ionic equation will make the voltage LESS POSITIVE (more negative)
    • increasing the conc of the substance on the RIGHT side of the ionic equation will make the voltage LESS POSITIVE (more negative)

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