Monograph
es .
pubs.acs.org/doi/book/10.1021/acsreagents
ha ng
EXPIRED yo fc
Ceric Ammonium Nitrate
on an d
ve
rsi
Portions of this monograph have been updated. Please visit http://pubs.acs.org/doi/full/10.1021/acsreagents.4086 for a summary of changes.
re
nt
ABSTRACT
rf
or
lin
kt
oc
ur
This monograph for Ceric Ammonium Nitrate provides, in addition to common physical constants, a general description including typical appearance, applications, and aqueous solubility. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Assay, Insoluble in Dilute Sulfuric Acid, Chloride, Phosphate, and Iron.
Ce4+
O-
ea
-O
O N+
6
Se
eh
2
de
NH4+
Formula Wt 548.20
CAS No.16774-21-3
ch
an
ge
d.
(NH4)2Ce(NO3)6
ha
ve
SUPPLEMENTS & UPDATES Authoritative
Expired
Type
Summary
28 Feb 2017
01 Jun 2016
01 Feb 2019
Original
First on-line publication, based on 11th ed.
Other Versions
on
og ra
ph
Published
hi sm
GENERAL DESCRIPTION
tio
ns o
ft
Typical appearance . . . . . . . . . . . . . . . . . . . orange-red or orange-yellow solid Applications . . . . . . . . . . . . . . . . . . . . . . . . oxidimetric standard Aqueous solubility . . . . . . . . . . . . . . . . . . . . 141 g in 100 mL
Po r
Downloaded via UNIV OF SASKATCHEWAN on August 20, 2019 at 16:05:17 (UTC). See https://pubs.acs.org/sharingguidelines for options on how to legitimately share published articles.
Part 4, Monographs for Reagent Chemicals: General Descriptions, Specifications, and Tests eISBN: 9780841230460 Tom Tyner Chair, ACS Committee on Analytical Reagents James Francis Secretary, ACS Committee on Analytical Reagents
su m m ar
(Ammonium Hexanitratocerate(IV))
© 2017 American Chemical Society
A
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI: 10.1021/acsreagents.4086.20160601 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
es .
pubs.acs.org/doi/book/10.1021/acsreagents
ha ng
SPECIFICATIONS
. . . .
. . . .
. . . .
. . . .
. . . .
. . . .
. . . .
. . . .
. . . .
. . . .
Maximum Allowable 0.05% 0.01% 0.02% 0.005%
su m m ar
. . . .
on an d
Insoluble in dilute sulfuric acid. Chloride (Cl) . . . . . . . . . . . . Phosphate (PO4) . . . . . . . . . . Iron (Fe) . . . . . . . . . . . . . . .
yo fc
Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥98.5% (NH4)2Ce(NO3)6
ve
rsi
TESTS
re
nt
Assay
rf
or
lin
kt
oc
ur
(By titration of oxidative capacity of CeIV). Weigh accurately 2.4–2.5 g, and dissolve in 50 mL of water. From a pipette, add 50 mL of 0.1 N ferrous ammonium sulfate volumetric solution, and swirl until the precipitate that forms is redissolved. Add 10 mL of phosphoric acid and 0.10 mL of diphenylaminesulfonic acid, sodium salt, indicator solution (described below). Titrate at once with 0.1 N potassium dichromate volumetric solution to a change from faint green to violet. Record this titration volume as A mL. Pipette 25 mL of 0.1 N ferrous ammonium sulfate volumetric solution into 50 mL of water, and treat it in the same way (with phosphoric acid and indicator but without sample). Titrate to a change from green to grayblue, and record this titration volume as B mL. One milliliter of 0.1 N ferrous ammonium sulfate corresponds to 0.05482 g of (NH4)2Ce(NO3)6.
de
[(2B − A mL) × N K 2Cr2O7 ] × 54.82 Sample wt (g)
Se
eh
ea
% (NH4)2 Ce(NO3)6 =
d.
For the Assay
ve
ch
an
ge
D i p h e n y l a m i n e s u l f o n i c A c i d , S o d i u m S a l t , I n d i c a t o r S o l u t i o n . Dissolve 0.10 g of the salt in 100 mL of water.
ha
Insoluble in Dilute Sulfuric Acid
hi sm
Chloride
on
og ra
ph
To 5.0 g, add 10 mL of sulfuric acid, stir, and then cautiously add 90 mL of water to dissolve. Heat to boiling, and digest in a preconditioned covered beaker on a hot plate (~100 °C) for 1 h. Filter through a tared filtering crucible, wash thoroughly, and dry at 105 °C.
ns o
ft
[Part 2: Colorimetry and Turbidimetry; Chloride]. Use 0.10 g dissolved in 10 mL of water. The comparison is best made by the general method for chloride in colored solutions.
tio
Phosphate
Po r
[Part 2: Colorimetry and Turbidimetry; Phosphate; Procedure for Phosphate, Method 2 (Extracted Molybdenum Blue)]. Dissolve 0.25 g in 30 mL of dilute sulfuric acid (1:9), add hydrogen peroxide until the solution just turns colorless, then boil to destroy excess peroxide. Cool, and dilute with water to 50 mL. Dilute 10 mL with water to 60 mL, and adjust the pH between 2 and 3 (using pH paper) with ammonium hydroxide.
© 2017 American Chemical Society
B
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI: 10.1021/acsreagents.4086.20160601 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
ha ng
es .
pubs.acs.org/doi/book/10.1021/acsreagents
yo fc
Note: This neutralization must be made with care to avoid formation of a permanent precipitate that would void the test. If this happens, discard the solution and start with another 10 mL.
on an d
su m m ar
Add 0.5 g of ammonium molybdate, and adjust the pH to 1.8 (using a pH meter) with dilute hydrochloric acid (1:9). Heat the solution to boiling and cool to room temperature. Dilute with water to 90 mL, add 10 mL of hydrochloric acid, and continue as described. Carry along a standard containing 0.01 mg of phosphate ion (PO4) in 10 mL of dilute sulfuric acid (3:47) treated exactly as the 10 mL of sample.
Iron
Po r
tio
ns o
ft
hi sm
on
og ra
ph
ha
ve
ch
an
ge
d.
Se
eh
ea
de
rf
or
lin
kt
oc
ur
re
nt
ve
rsi
[Part 2: Colorimetry and Turbidimetry; Iron; Procedure for Iron, Method 2 (Hydroxylamine and 1,10-Phenanthroline)]. Dissolve 1.0 g in 30 mL of dilute sulfuric acid (1:9), and add, dropwise, 3% hydrogen peroxide solution until the yellow color disappears. For the standard, add 0.05 mg of iron ion (Fe) to 30 mL of dilute sulfuric acid (1:9) and the same volume of 3% hydrogen peroxide solution used for the sample. To each solution, add ammonium hydroxide until the pH is between 1 and 3, cool to room temperature, and adjust the pH to 3.5 (using a pH meter). Dilute each solution with water to 50 mL, and use 10 mL of each.
© 2017 American Chemical Society
C
ACS Reagent Chemicals ACS Reagent Chemicals; American Chemical Society: Washington, DC, 2017.
DOI: 10.1021/acsreagents.4086.20160601 ACS Reagent Chemicals, Part 4
