Answered: ± 0.00098 18 Bromocresol green 0.08641…

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± 0.00098 18 Bromocresol green 0.08641 ± 0.00113 29 Is the difference between indicators

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter3: Statistical Tests With Excel

Section: Chapter Questions

Problem 6P

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Concept explainers

Potentiometric Titrations

Potentiometric titration is one of the important titration methods and is mainly carried out to characterize acid solutions. It follows a method similar to that of the normal titration technique, but the main difference is that there is no indicator used in the potentiometric titrations. Instead of using an indicator, electrodes are employed for monitoring the whole titration process. A scientist named Robert Behrend did the potentiometric titration for the first time, and it was done using the mercurous solution and potassium chloride.

Question

100%

SCE students measured the concentration of HCl in a solution by titrating with different indicators
to find the end point.
Indicator Mean HCl concentration (M)
(± standard deviation)
Number of measurements
Bromothymol blue 0.09565 ± 0.00225 28
Methyl red 0.08686 ± 0.00098 18
Bromocresol green 0.08641 ± 0.00113 29
Is the difference between indicators 1 and 2 significant at the 95% confidence level? Answer the
same question for indicators 2 and 3

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