Quantitative Chemical Analysis
Quantitative Chemical Analysis
9th Edition
ISBN: 9781464135385
Author: Daniel C. Harris
Publisher: W. H. Freeman
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Chapter 15, Problem 15.28P
Interpretation Introduction

Interpretation:

The pH of the unknown +50.0mV and slope of the calibration curve (mV/pHunit) and the theoretical slope at 200C and the value of β has to be calculated.

Concept Introduction:

Calibrating a glass electrode:

When u calibrate an electrode with standard buffers, to calculate the voltage with each buffer. The pH of buffer S1 is pHS1 and measured electrode potential in that buffer is ES1 .

The pH of buffer S2 is pHS2 and measured electrode potential in that buffer is ES2 .

E-ES1pH-pHS1=ES2-ES1pHS2-pHS1

The slope of the line is

ΔEΔpH=ES2-ES1pHS2-pHS1

Theoretical slope= RTln10F

β=observedslopetheoreticalslope

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