Question

Fluoride ion selective electrodes obey the following
equation:

E(V) = K -
β(0.0592)log[F^{-}]

where the fluoride concentration is expressed as mol/L and the
temperature coefficient β 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 β. Use
the plotting and linear regression tools in Excel to calculate K
and β from the data in the table. The coefficient β is close to 1,
and can be determined from a calibration curve.

Data:

F^{-} concentration (mg/L) |
E(V) |

10.0 | -0.358 |

12.0 | -0.362 |

14.0 | -0.366 |

16.0 | -0.369 |

18.0 | -0.372 |

20.0 | -0.375 |

We are asked to find the value for K and beta.

For K, I got 0.949

For beta, I got -0.542

However, both values were wrong. I appreciate any help and/or explanation!

Answer #1

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