Nickel Sulfate Hexahydrate | ACS Reagent Chemicals

Feb 28, 2017 - 98.0–102.0% NiSO4·6H2O. Maximum Allowable; Insoluble matter: Maximum Allowable. 0.005%. Chloride (Cl): Maximum Allowable. 0.001%...
0 downloads 0 Views 82KB Size
Monograph pubs.acs.org/doi/book/10.1021/acsreagents

Nickel Sulfate Hexahydrate (Nickel(II) Sulfate Hexahydrate; Nickelous Sulfate Hexahydrate) 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 Nickel Sulfate Hexahydrate 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, Nitrogen Compounds, Calcium, Cobalt, Copper, Iron, Magnesium, Manganese, Potassium, and Sodium.

NiSO4 • 6H2O

Formula Wt 262.85

CAS No. 10101-97-0

GENERAL DESCRIPTION Typical appearance . . . . . . . . . . . . . . . . . . . blue to green solid Applications . . . . . . . . . . . . . . . . . . . . . . . . source of nickel in standards Change in state (approximate) . . . . . . . . . . . . melting point, loses 5 H2O at 100 °C; greenish-yellow anhydrous salt forms at 280 °C Aqueous solubility . . . . . . . . . . . . . . . . . . . . soluble in 1.4 parts water

SPECIFICATIONS Assay . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98.0–102.0% NiSO4 · 6H2O Maximum Allowable Insoluble matter . . . . . . . . . . . . . . . . . . . . . 0.005% Chloride (Cl) . . . . . . . . . . . . . . . . . . . . . . . 0.001% Nitrogen compounds (as N) . . . . . . . . . . . . . . 0.002% Calcium (Ca) . . . . . . . . . . . . . . . . . . . . . . . 0.005% Cobalt (Co) . . . . . . . . . . . . . . . . . . . . . . . . 0.002% Copper (Cu) . . . . . . . . . . . . . . . . . . . . . . . . 0.005% Iron (Fe) . . . . . . . . . . . . . . . . . . . . . . . . . . 0.001% Magnesium (Mg) . . . . . . . . . . . . . . . . . . . . . 0.005%

© 2017 American Chemical Society

A

DOI:10.1021/acsreagents.4240 ACS Reagent Chemicals, Part 4

ACS Reagent Chemicals

Monograph

pubs.acs.org/doi/book/10.1021/acsreagents

Manganese (Mn) . . . . . . . . . . . . . . . . . . . . . 0.002% Potassium (K) . . . . . . . . . . . . . . . . . . . . . . . 0.01% Sodium (Na) . . . . . . . . . . . . . . . . . . . . . . . . 0.05%

TESTS Assay (By complexometric titration of nickel). Weigh accurately about 1 g, transfer to a 400 mL beaker, and dissolve in 250 mL of water. Add 10 mL of pH 10 ammoniacal buffer solution and about 50 mg of murexide indicator mixture. Titrate immediately with 0.1 M EDTA volumetric solution to a purple color. One milliliter of 0.1 M EDTA corresponds to 0.02628 g of NiSO4 · 6H2O.

Insoluble Matter [Part 2: Gravimetric Methods; Insoluble Matter]. Use 20 g dissolved in 150 mL of water.

Chloride Dissolve 1.0 g in 15 mL of water, filter if necessary through a small chloride-free filter, and add 1 mL of nitric acid and 1 mL of silver nitrate reagent solution. Any turbidity should not exceed that produced by 0.01 mg of chloride ion (Cl) in an equal volume of solution containing the quantities of reagents used in the test. The comparison is best made by the general method for chloride in colored solutions, [Part 2: Colorimetry and Turbidimetry; Chloride].

Nitrogen Compounds [Part 2: Colorimetry and Turbidimetry; Nitrogen Compounds: Test for Ammonia, Amines, and Nitrogen Compounds Reduced by Aluminum]. Use 1.0 g. For the standard, use 0.02 mg of nitrogen ion (N).

Calcium, Cobalt, Copper, Iron, Magnesium, Manganese, 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, Cobalt, Copper, Iron, Magnesium, Manganese, 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 in 75 mL of water and 2 mL of nitric acid. Transfer to a 100 mL volumetric flask, and dilute to the mark with water (1 mL = 0.20 g).

© 2017 American Chemical Society

B

DOI:10.1021/acsreagents.4240 ACS Reagent Chemicals, Part 4

ACS Reagent Chemicals

Monograph

pubs.acs.org/doi/book/10.1021/acsreagents

For the Determination of Calcium, Cobalt, Copper, Iron, Magnesium, Manganese, Potassium, and Sodium

Element

Wavelength (nm)

Sample Wt (g)

Standard Added (mg)

Flame Type*

Background Correction

Ca

422.7

2.0

0.05; 0.10

N/A

No

Co

240.7

2.0

0.02; 0.04

A/A

Yes

Cu

324.8

2.0

0.05; 0.10

A/A

Yes

Fe

248.3

4.0

0.04; 0.08

A/A

Yes

Mg

285.2

0.20

0.005; 0.01

A/A

Yes

Mn

279.5

2.0

0.02; 0.04

A/A

Yes

K

766.5

0.20

0.01; 0.02

A/A

No

Na

589.0

0.04

0.01; 0.02

A/A

No

*A/A is air/acetylene; N/A is nitrous oxide/acetylene.

© 2017 American Chemical Society

C

DOI:10.1021/acsreagents.4240 ACS Reagent Chemicals, Part 4