Harris book: 27-11. To find the Ce4+ content of a solid, 4.37 g were dissolved and treated with excess iodate to precipitate Ce(IO,)4. The precipi- tate was collected, washed well, dried, and ignited to produce 0.104 g of CeO, (FM 172.114). What was the weight percent of Ce in the original solid?

Harris book: 27-11. To find the Ce4+ content of a solid, 4.37 g were dissolved and treated with excess iodate to precipitate Ce(IO,)4. The precipi- tate was collected, washed well, dried, and ignited to produce 0.104 g of CeO, (FM 172.114). What was the weight percent of Ce in the original solid?

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter34: Miscellaneous Separation Methods

Section: Chapter Questions

Problem 34.15QAP

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Question

A problem and its solution is attached. Please explain each step for me to understand better. (Also, please explain why the moles of CeO₂and moles of Ce is equal to each other)

Harris book:
27-11. To find the Ce4+ content of a solid, 4.37 g were dissolved
and treated with excess iodate to precipitate Ce(IO,)4. The precipi-
tate was collected, washed well, dried, and ignited to produce 0.104 g
of CeO, (FM 172.114). What was the weight percent of Ce in the
original solid?

The Porecipitate of ce( Iog)y i ignited 40 Produce
4
O- 104 g Celz (FM 172.11y
Number of moles of CeOz ins
0. 104 8
172.114 8/mul
* 6. 8425 x10-4 meles.
6. O425 x10"4
CeOz
6.0425 x10-" male ce
Atomic mass of Ce
ILI0. 116
6.0425X10-u mal ce =
(6.0425 x10ml4
x IL10.116) ce
: O. 08 LI6 { ce
0.0846 g Ce ,
we got
forom 4.37 g solid.
: % of ce in sid:
O- 0846
= 1.935 o
X 100
4.37

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