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20 Cards in this Set
- Front
- Back
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Define electrochemistry:
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the measurement of substances using the principles of electricity
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Name the 2 redox reactions of substances:
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Oxidation: lose electrons = + charge
Reduction: gain electrons = - charge |
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What is an oxidized electron called?
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Cathode (+)
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What is a reduced electron called:
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Anode (-)
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Define Voltage (E):
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energy (push)
E |
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Define Current (I):
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Flow
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Define Resistance (R):
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opposing force
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Define Ohm's Law:
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E = I(R)
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What are the 2 types of electrodes?
Which is constant? And name examples? |
Measuring/indicating
Reference (constant) - hydrogen, silver, calomel electrodes |
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Define the Nernst Equation:
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Measures E.
Voltage = activity |
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What are the 2 types of electrode measurements?
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Potentiometric
Amperometric |
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Potentiometric Electrodes are what 2 types:
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Redox electrodes
Ion Selective electrodes (ISE) |
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What electrons are used in Redox Electrodes?
What are they measured against? |
Metal: silver, platinum, gold
measured against a hydrogen electrode |
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Define a potentiometric electrode measurements:
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measures the energy produced by redox reactions
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What are the 3 parts to a redox electrode measuring test?
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Oxidation Cathode (+) - losing electrons
salt bridge (bridges electrical connection Reduction Anode (-) - gains electrons |
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In ISE Potentiometric Electrodes, membranes are selective for specific:
What are the 4 types of membranes used? |
cations & anions
Glass membrane Solid state Liquid Combination |
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What is the principle of Amperometric Testing?
What analyte/specific elctrode is used? What does it sense? |
there is a constant flow due to added E
pO2/Clark electrode: gas sensing |
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Name the 2 standard potentiometric electrodes:
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pH (Sanz) – glass membrane ISE
pCO2 (Servinghaus) – Gas sensing *directly measures H ion using the pH electrode |
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How do you calibrate an electrochemical assay?
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Calibrate "0" potential
calibrate a 2nd point draw a line of best fit. NO SHIFTS! |
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Name 3 errors possible in electrochemistry?
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temp
dirt Interfering Ions Proteins Bubbles |
