Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Lead Nitrate (Lead(II) Nitrate) 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
ABSTRACT This monograph for Lead Nitrate provides, in addition to common physical constants, a general description including typical appearance, applications, change in state (approximate), 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 Matter, Chloride, Calcium, Copper, Iron, Potassium, and Sodium.
Pb(NO3)2
Formula Wt 331.20
CAS No. 10099-74-8
GENERAL DESCRIPTION Typical appearance . . . . . . . . Applications . . . . . . . . . . . . . Change in state (approximate) . Aqueous solubility . . . . . . . . .
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white solid titrant for complexometric titration melting point, 470 °C, with decomposition 56.5 g in 100 mL at 20 °C
SPECIFICATIONS Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥99.0% Pb(NO3)2 Maximum Allowable Insoluble matter . . . . . . . . . . . . . . . . . . . . . 0.005% Chloride (Cl) . . . . . . . . . . . . . . . . . . . . . . . 0.001% Calcium (Ca) . . . . . . . . . . . . . . . . . . . . . . . 0.005% Copper (Cu) . . . . . . . . . . . . . . . . . . . . . . . . 0.002% Iron (Fe) . . . . . . . . . . . . . . . . . . . . . . . . . . 0.001% Potassium (K) . . . . . . . . . . . . . . . . . . . . . . . 0.005% Sodium (Na) . . . . . . . . . . . . . . . . . . . . . . . . 0.02%
© 2017 American Chemical Society
A
DOI:10.1021/acsreagents.4191 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
TESTS Assay (By complexometric titration of Pb). Weigh accurately about 1.3 g, transfer to a 400 mL beaker, and dissolve in 250 mL of water containing 0.15 mL of acetic acid. Add 15 mL of hexamethylenetetramine reagent solution. Add a few milligrams of xylenol orange indicator mixture, and titrate with 0.1 M EDTA volumetric solution to a yellow color. One milliliter of 0.1 M EDTA corresponds to 0.03312 g of Pb(NO3)2.
Insoluble Matter [Part 2: Gravimetric Methods; Insoluble Matter]. Use 20 g dissolved in 200 mL of dilute nitric acid (1:99).
Chloride [Part 2: Colorimetry and Turbidimetry; Chloride]. Use 1.0 g.
Calcium, Copper, Iron, Potassium, and Sodium (By flame AAS, [Part 2: Trace and Ultratrace Elemental Analysis; Atomic Absorption Spectroscopy; Analysis; Procedure for Flame AAS]).
For the Determination of Calcium, Copper, Iron, Potassium, and Sodium
S a m p l e S t o c k S o l u t i o n . Dissolve 20.0 g of sample with 60 mL of water, and add 10 mL of nitric acid. Transfer to a 100 mL volumetric flask, and dilute to the mark with water (1 mL = 0.2 g).
For the Determination of Calcium, Copper, Iron, Potassium, and Sodium
Element
Wavelength (nm)
Sample Wt (g)
Standard Added (mg)
Flame Type*
Background Correction
Ca
422.7
1.0
0.05; 0.10
N/A
No
Cu
324.7
1.0
0.02; 0.04
A/A
Yes
Fe
248.3
4.0
0.04; 0.08
A/A
Yes
K
766.5
1.0
0.025; 0.05
A/A
No
Na
589.0
0.10
0.01; 0.02
A/A
No
*A/A is air/acetylene; N/A is nitrous oxide/acetylene.
© 2017 American Chemical Society
B
DOI:10.1021/acsreagents.4191 ACS Reagent Chemicals, Part 4
