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The selectivity coefficient, KL.H' for a Li + ion selective electrode is 4 × 104, when...
7. (10 points) a) The selectivity coefficient for a Bromide ion-selective electrode is on 0.15. What...
7. (10 points) a) The selectivity coefficient for a Bromide ion-selective electrode is on 0.15. What will the change in the electrode potential be for a 1.4 x 10" M Br" at pH 5.5 if the pH is raised to pH 11.0? b) A PH probe is calibrated against pH 4 and pH 7 buffers. For pH 4 buffer, E = 200 mV and for pH 7 buffer, E = 23 mV. If the potential for an unknown solution is...
An ammonium ion selective electrode exhibits interference from lithium ions with a selectivity coefficient of 0.2....
An ammonium ion selective electrode exhibits interference from lithium ions with a selectivity coefficient of 0.2. If a 0.10 M solution of ammonium has an electrode potential of 0.125 V what is the expected potential in a solution containing both 0.1 M ammonium and 0.1 M lithium? Recall that the Nernst equation for a cation selective electrode with interferent is Ecell L'002 Logho(a + Kb) where a and b are the activities(-concentrations) of the selective ion and interfering ion, respectively.
Question 4 of 4 > Potential (my -21.9 Calibration data for a bromide ion-selective electrode (ISE) was collected...
Question 4 of 4 > Potential (my -21.9 Calibration data for a bromide ion-selective electrode (ISE) was collected and recorded in the table. The potential of the ISE was measured against a saturated calomel electrode (SCE). All solutions were buffered at a pH of 7.56. A linear calibration curve can be constructed from this data as a plot of potential (in mV) vs. pBr. Determine the slope and y-intercept of such a plot of the calibration data given. [Br"](M) 0.300...
(5) The following data represent the potentials of a fluoride ion-selective electrode vs SCE for several...
(5) The following data represent the potentials of a fluoride ion-selective electrode vs SCE for several solutions. All solutions are made up in a way to control their pH and ionic strength, and contain added EDTA. Prepare an excel plot of the measured potential vs pF based on this information and determine the concentration of fluoride in each unknown solution. 5 Solution (M) Potential (mv) 5.0 x 102 -22.4 .0 x 103 36.8 5.0 x 104 96.0 5.0 x 10-...
Calibration data for a bromide ion‑selective electrode (ISE) was collected and recorded in the table. The...
Calibration data for a bromide ion‑selective electrode (ISE) was collected and recorded in the table. The potential of the ISE was measured against a saturated calomel electrode (SCE). All solutions were buffered at a pH of 7.56. A linear calibration curve can be constructed from this data as a plot of potential (in mV) vs. pBr. Determine the slope and y‑intercept of such a plot of the calibration data given. Br-M Potential (mV 0.300 -21.6 0.0300 36.7 0.00300 96.5 0.000300...
Calibration data for a bromide ion-selective electrode (ISE) was collected and recorded below. The potential of...
Calibration data for a bromide ion-selective electrode (ISE) was collected and recorded below. The potential of the ISE was measured against a saturated calomel electrode (SCE). All solutions were buffered at a pH of 7.56. A linear calibration curve can be constructed from this data as a plot of potential (in mV) vs. pBr. Determine the slope and y-intercept of such a plot of the calibration data given [Br] (M) Potential (mV) 0.300 0.0300 0.00300 96.4 0.000300 155.1 0.0000300 224.8...
Potential (mV) [Br](M) 0.300 Calibration data for a bromide ion-selective electrode (ISE) was collected and recorded in...
Potential (mV) [Br](M) 0.300 Calibration data for a bromide ion-selective electrode (ISE) was collected and recorded in the table. The potential of the ISE was measured against a saturated calomel electrode (SCE). All solutions were buffered at a pH of 7.56. A linear calibration curve can be constructed from this data as a plot of potential (in mV) vs. pBr. Determine the slope and y-intercept of such a plot of the calibration data given. -21.2 0.0300 36.2 95.7 0.00300 0.000300...
(4) A cyanide ion-selective electrode obeys the equation, E-K-0.05916log(CN). The potential was - 0.230 V when...
(4) A cyanide ion-selective electrode obeys the equation, E-K-0.05916log(CN). The potential was - 0.230 V when the electrode was immersed in 1.00 mM NaCN. (a) Evaluate the constant in the equation (b) Using the result from part (a), find (CN) if E=-0.280 V. (c) Without using the constant from part (a), find (CN) if E= -0.280 V.
7. (10 points) a) The selectivity coefficient for a Bromide ion-selective electrode is on 0.15. What will the change in the electrode potential be for a 1.4 x 10" M Br" at pH 5.5 if the pH is raised to pH 11.0? b) A PH probe is calibrated against pH 4 and pH 7 buffers. For pH 4 buffer, E = 200 mV and for pH 7 buffer, E = 23 mV. If the potential for an unknown solution is...
An ammonium ion selective electrode exhibits interference from lithium ions with a selectivity coefficient of 0.2. If a 0.10 M solution of ammonium has an electrode potential of 0.125 V what is the expected potential in a solution containing both 0.1 M ammonium and 0.1 M lithium? Recall that the Nernst equation for a cation selective electrode with interferent is Ecell L'002 Logho(a + Kb) where a and b are the activities(-concentrations) of the selective ion and interfering ion, respectively.
Question 4 of 4 > Potential (my -21.9 Calibration data for a bromide ion-selective electrode (ISE) was collected and recorded in the table. The potential of the ISE was measured against a saturated calomel electrode (SCE). All solutions were buffered at a pH of 7.56. A linear calibration curve can be constructed from this data as a plot of potential (in mV) vs. pBr. Determine the slope and y-intercept of such a plot of the calibration data given. [Br"](M) 0.300...
(5) The following data represent the potentials of a fluoride ion-selective electrode vs SCE for several solutions. All solutions are made up in a way to control their pH and ionic strength, and contain added EDTA. Prepare an excel plot of the measured potential vs pF based on this information and determine the concentration of fluoride in each unknown solution. 5 Solution (M) Potential (mv) 5.0 x 102 -22.4 .0 x 103 36.8 5.0 x 104 96.0 5.0 x 10-...
Calibration data for a bromide ion-selective electrode (ISE) was collected and recorded below. The potential of the ISE was measured against a saturated calomel electrode (SCE). All solutions were buffered at a pH of 7.56. A linear calibration curve can be constructed from this data as a plot of potential (in mV) vs. pBr. Determine the slope and y-intercept of such a plot of the calibration data given [Br] (M) Potential (mV) 0.300 0.0300 0.00300 96.4 0.000300 155.1 0.0000300 224.8...
Potential (mV) [Br](M) 0.300 Calibration data for a bromide ion-selective electrode (ISE) was collected and recorded in the table. The potential of the ISE was measured against a saturated calomel electrode (SCE). All solutions were buffered at a pH of 7.56. A linear calibration curve can be constructed from this data as a plot of potential (in mV) vs. pBr. Determine the slope and y-intercept of such a plot of the calibration data given. -21.2 0.0300 36.2 95.7 0.00300 0.000300...
(4) A cyanide ion-selective electrode obeys the equation, E-K-0.05916log(CN). The potential was - 0.230 V when the electrode was immersed in 1.00 mM NaCN. (a) Evaluate the constant in the equation (b) Using the result from part (a), find (CN) if E=-0.280 V. (c) Without using the constant from part (a), find (CN) if E= -0.280 V.
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