Quantitative Chemical Analysis 7e

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Elechtrochemistry
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How much? Faradays constant.
F (6.022 x 1023 mol-1) x (1.602192 x 10-19 C)
96,484 C mol-1
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Faraday
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Electricity
Current Charge/time - I Q/t
AmpereCoulomb/sec
Potential Current x Resistance - E I R
(Ohms law) VoltAmpere Ohm
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So what is resistance?
NB Potential is relative!
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Work Potential x Charge - W E q Joule
Volt Coulomb
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NERNST EQUATION
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NERNST EQUATION
At 25 oC
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NERNST EQUATION
Walther Hermann Nernst 18641941
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NERNST EQUATION
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NERNST EQUATION
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THERMODYNAMICS and equilibrium
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THERMODYNAMICS and equilibrium
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NERNST EQUATION
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0.50 M AgNO3(aq)
0.010 M Cd(NO3)2(aq)
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0.50 M AgNO3(aq)
0.010 M Cd(NO3)2(aq)
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0.50 M AgNO3(aq)
0.010 M Cd(NO3)2(aq)
My way
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Ion selective electrode
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Ion selective electrode
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Ion selective electrode
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Ion selective electrode
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Ion selective electrode
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Ion selective electrode
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Ion selective electrode
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Ion selective electrode
CHEM-7 is a group of blood tests that provides
information about your body's metabolism. The
test is commonly called a basic metabolic panel.
BUN 7 to 20 mg/dL CO2 (carbon dioxide) 20 to
29 mmol/L Creatinine 0.8 to 1.4 mg/dL Glucose
64 to 128 mg/dL Serum chloride 101 to 111
mmol/L Serum potassium 3.7 to 5.2 mEq/L Serum
sodium 136 to 144 mEq/L
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Ion selective electrode
Selectivity And interference
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NERNST EQUATION
Measure E to determine 1 unknown
concentration (..so fix the other concentrations)
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Reference electrodes
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Reference electrodes
My way
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Reference electrodes