1a) We know that the emf produced in the glass electrode system varies linearly in pH.
ie; (pH)u = (pH)s + ((E(cell)S - E(cell)u)/0.0591
=7.00 +(0.397V - 0.209V)/0.0591
=10.2
thank you in advance for the help 1. A pH glass electrode has a potential of...
A lithium ion-selective electrode gave the potentials given in the table below for the following standard solutions of LiCl and two samples of unknown concentration Solution ([Li+]/M) Potential vs. SCE, mV 0.100 M +1.0 0.050 M -30.0 0.010 M -60.0 0.001 M -138.0 Unknown 1 -48.5 Unknown 2 -75.3 Draw a calibration curve of the electrode potential versus log[Li+] and determine if the electrode is displaying nernstain behaviour. Use a linear least squares procedure to determine the concentration of the...
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...
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...
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...
(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 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...
(3) A student generated the following calibration curve by recording the potential readings when a fluoride ion selective electrode is dipped in a series of fluoride standards: y = 50.5 – 54.62log[F- ]. If a mouthwash solution gave a certain potential reading (e.g. 210 mV), what is the molar concentration of fluoride in the mouthwash solution?
(1) When calibrating a glass electrode, 0.025 M potassium dihydrogen phosphate/0.025 M disodium hydrogen phosphate buffer (pH = 6.881) gave a reading of -18.3 mV at 20 °C and 0.050 M potassium hydrogen phthalate buffer (pH = 3.788) gave a reading of +146.3 mV. What is the pH of an unknown giving a reading of +50.0 mV? What is the slope of the calibration curve (mV/pH units) and what is the theoretical slope at 20 °C? Find the value of...
A sodium ion electrode was calibrated by measuring the cell potentials of several standard Na+ solutions. The other electrode was the SCE. The calibration data are shown in the following table. Log[Na+] Ecell (mV) -1 -165.6 0 -110.0 1 -51.8 2 6.5 3 64.5 a. Plot a calibration curve for these data. b. Determine the slope and intercept for the regression line of this plot. Is the response of this sodium electrode Nernstian? Explain. c. A 10.00mL aliquot of table...
In a 3-electrode cell filled with a solution of dopamine, the potential of the working electrode is scanned from +0.2 V to +0.7 V vs. a Ag/AgCl reference electrode. The current rises exponentially and then peaks at +0.48 V followed by a decay (gradual decrease) in current. What causes the decrease in current? The concentration of dopamine near the electrode decreases. All of the dopamine in the solution is consumed. A second reaction begins to interfere at such positive potentials....