Monograph pubs.acs.org/doi/book/10.1021/acsreagents
Hydrazine Sulfate 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 Hydrazine Sulfate 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, Residue after Ignition, Chloride, Heavy Metals, and Iron.
(NH2)2 • H2SO4
Formula Wt 130.12
CAS No. 10034-93-2
GENERAL DESCRIPTION Typical appearance . . . . . . . . Applications . . . . . . . . . . . . . Change in state (approximate) . Aqueous solubility . . . . . . . . .
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colorless solid gravimetric determination of nickel, cobalt, and cadmium melting point, 254 °C 3.4 g in 100 mL at 25 °C
SPECIFICATIONS Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . ≥99.0% (NH2)2 · H2SO4 Maximum Allowable Insoluble matter . . . . . . . . . . . . . . . . . . . . . 0.005% Residue after ignition. . . . . . . . . . . . . . . . . . 0.05% Chloride (Cl) . . . . . . . . . . . . . . . . . . . . . . . 0.005% Heavy metals (as Pb) . . . . . . . . . . . . . . . . . . 0.002% Iron (Fe) . . . . . . . . . . . . . . . . . . . . . . . . . . 0.001%
© 2017 American Chemical Society
A
DOI:10.1021/acsreagents.4159 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
TESTS Assay (By titration of reducing power). Weigh accurately about 1 g, dissolve in water in a 500 mL volumetric flask, and dilute to the mark with water. Take 50.0 mL, dissolve 1 g of sodium bicarbonate, and add 50.0 mL of 0.1 N iodine volumetric solution. Titrate the excess iodine with 0.1 N sodium thiosulfate volumetric solution, adding 3 mL of starch indicator solution near the end point. One milliliter of 0.1 N iodine corresponds to 0.003253 g of (NH2)2 · H2SO4.
Insoluble Matter [Part 2: Gravimetric Methods; Insoluble Matter]. Use 20 g dissolved in 300 mL of water.
Residue after Ignition [Part 2: Gravimetric Methods; Residue after Ignition]. Ignite 2.0 g. Reserve the residue for the test for iron.
Chloride [Part 2: Colorimetry and Turbidimetry; Chloride]. Dissolve 1.0 g in water, dilute with water to 100 mL, and use 20 mL of this solution.
Heavy Metals [Part 2: Colorimetry and Turbidimetry; Heavy Metals (as Lead); Procedure for Heavy Metals, Method 1]. Dissolve 2.0 g in 40 mL of warm water. Use 30 mL to prepare the sample solution, and use the remaining 10 mL to prepare the control solution.
Iron [Part 2: Colorimetry and Turbidimetry; Iron; Procedure for Iron, Method 1 (Ammonium Thiocyanate)]. To the residue after ignition, add 3 mL of dilute hydrochloric acid (1:1) and 0.10 mL of nitric acid, cover with a watch glass, and digest on a hot plate (~100 °C) for 15–20 min. Remove the watch glass, and evaporate to dryness. Dissolve the residue in a mixture of 4 mL of hydrochloric acid and 10 mL of water, and dilute with water to 100 mL. Use 50 mL of this solution without further acidification.
© 2017 American Chemical Society
B
DOI:10.1021/acsreagents.4159 ACS Reagent Chemicals, Part 4
