Analytical chemistry. Please help! Fluoride ion selective electrodes obey the fo

Question

Analytical chemistry. Please help!

Fluoride ion selective electrodes obey the following equation: E(V) = K - beta(0.0592)log[F^-] where the fluoride concentration is expressed as mol/L and the temperature coefficient Beta is normally equal to 1. In a normal calibration procedure you dilute a standard fluoride solution to between 10 and 20 mg/L fluoride ion and then measure the response of the electrode. You then plot the data and do a linear regression to obtain the fitting coefficients K and Beta. Use the plotting and linear regression tools in Excel to calculate K and Beta from the data in the table. The coefficient Beta is close to 1, and can be determined from a calibration curve. What value of K do you obtain from your plot? -0.518 What value of Beta do you obtain from your plot? 1.03

Explanation / Answer

from the equation ,E(V)= K-B*(0.0592)*lof F draw a plot of E(v) vs log F. The slope of the straight line gives -B*0.0592 and intercept is K

the data points are plotted and shown below

the slope is -0.058, B*0.0592=0.058, B= 0.058/0.0592= 0.98

and intercept is K=-0.261

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