Calibration data for a bromide ion-selective electrode (ISE) was collected and r

Question

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. log[Br^-]. Determine the slope and y-intercept of such a plot of the calibration data given. slope = y-intercept = Two unknown solutions were tested for [Br^-] using the same bromide ISE. The potential reading for unknown 1 was 18.5 mV and the potential reading for unknown 2 was 163.9 mV. Using the calibration curve you constructed above, determine the concentration of Br^- in each unknown solution. Unknown 1 [Br^-] = Unknown 2 [Br^-] =

Explanation / Answer

a plot of log [Br-] Vs potential is calculated and the plot is shown below

The equation of best fit is, potential (mV)= -61.09* log [Br-] - 55.963

slope = -61.09 and intercept= -55.963

unknown- 118.5= -61.09* log [Br-] -55.963, [Br-] =0.060

for unknown-2, 163.9= -61.09* log [Br-] -55.963, [Br-] = 0.000252

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