Double Junction
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OAKTON DOUBLE JUNCTION pH TESTR 30 NUTRIENT METER |  |
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OAKTON DOUBLE JUNCTION pH TESTR 10 NUTRIENT METER | |
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Double Junction
this is Analytical chemistry Ion Selective Electrode pre lab question... please help?
1. What is the relationship between mV reading and ppm concentration when using the ISE?
2. Why is a double junction, not a single junction reference electrode, used in this analysis( ISE)?
3. What is the molar concentration of a 253 ppm chloride solution?
1. mV and concentration are related by the Nernst equation.
If you plot potential vs log[concentration] you should get a straight line with gradient +/- 58/n mV per decade concentration where n = number of electrons in the reaction. So fo chloride electrode the slope would be -58 mV per decade concentration
2. Assuming you mean the chloride analysis mentioned in part 3, a double junction reference electrode is needed as a single junction one would leak chloride ion into the analyte solution.
3. ppm = mg/L, so work it out for yourself.
Double Junction
|
|
OAKTON DOUBLE JUNCTION pH TESTR 30 NUTRIENT METER | |
|
US $134.95 | 16d 20h 59m |
|
OAKTON DOUBLE JUNCTION pH TESTR 10 NUTRIENT METER | |
|
US $109.95 | 16d 20h 23m |
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