An ammonium ion selective electrode responds to both NH4+ and H+, but
not to NH3. (pKa=9.244 for NH4+)
What pH conditions must be imposed to ensure the electode properly
represents toe activity of NH4+ (SHOW ALL MATH).
Why is the ionic strength an important factor when using this or any
ISE? How can you compensate for this effect?
Using the Formula EISE = constant + RT/nF ln(ai +ki,jaj), what are the
TWO pH conditions that present 10% error on a measurement of 1.00 x10-4M
NH4+, if kNH4+ H+ = 0.035? You may assume identical activity
coefficients
Chemistry Homework Solutions
#59001
Electrode Chemistry
An ammonium ion selective electrode responds to both NH4+ and H+, but not to NH3. (pKa=9.244 for NH4+)
A) What pH conditions must be imposed to ensure the electode properly represents toe activity of NH4+ (SHOW ALL MATH).
B) Why is the ionic strength an important factor when using this or any ISE? How can you compensate for this effect?
C) Using the Formula EISE = constant + RT/nF ln(ai +ki,jaj), what are the TWO pH conditions that present 10% error on a measurement of 1.00 x10-4M NH4+, if kNH4+ H+ = 0.035? You may assume identical activity coefficients
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