calculate the amount of Mn in the unknown

Principles of Instrumental Analysis
7th Edition
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Chapter9: Atomic Absorption And Atomic Fluorescence Spectrometry
Section: Chapter Questions
Problem 9.7QAP
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You are given two containers, one with 3.00 mg Mn 2+ and one with an unknown amount of Mn 2+ .
You oxidize the Mn 2+ to the purple permanganate ion (MnO 4 - ) and dilute the solutions to 250.0 mLs.
The solution containing the 3.00 mg Mn is used to prepare a third solution containing 1.50 mg Mn.
The transmittances of the solutions are measured at 530 nm using a dilapidated Spectronic 20. From
the data below, calculate the amount of Mn in the unknown. For a linear curve, consider y=kx+b

Mn (mg)        %T
3.00               30.8
1.50               55.2
Unknown       37.4

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