You wish to measure the iron content of the well water on the new property you are about to buy. You prepare a referencestandard Fe" solution with a concentration of 8.99 x 10 M. You treat 15.0 ml. of this reference with HNo, and excess KSCNto form a red complex and dilute the reference to 40.0 ml. The diluted reference is placed in a cell with a 1.00-cm light path.You then take 25.0 ml of the well water, treat with HNO, and excess KSCN, and dilute to 100.0 ml. This diluted sample isplaced in a variable pathlength cell. The absorbance of the reference and the sample solutions match when the pathlength is1.65 cm. What is the concentration of iron in the well water? For cach solution, the zero is set with a blank.(Fe*l wr00136Marect

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Answered: ed in a variable pathlength cell. The…

ed in a variable pathlength cell. The absorbance of the reference and the sa cm. What is the concentration of iron in the well water? For each solution

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter12: Spectrochemical Methods

Section: Chapter Questions

Problem 8P

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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

You wish to measure the iron content of the well water on the new property you are about to buy. You prepare a reference
standard Fe" solution with a concentration of 8.99 x 10 M. You treat 15.0 ml. of this reference with HNo, and excess KSCN
to form a red complex and dilute the reference to 40.0 ml. The diluted reference is placed in a cell with a 1.00-cm light path.
You then take 25.0 ml of the well water, treat with HNO, and excess KSCN, and dilute to 100.0 ml. This diluted sample is
placed in a variable pathlength cell. The absorbance of the reference and the sample solutions match when the pathlength is
1.65 cm. What is the concentration of iron in the well water? For cach solution, the zero is set with a blank.
(Fe*l wr
00136
M
arect

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