ProductProfile
Sodium Sulfate, Anhydrous Baker Analyzed® ACS Reagent Powder
Product Number 3898
Na2SO4
THE BAKER
ADVANTAGE:
BAKER ANALYZED® Sodium Sulfate, Anhydrous, Powder has lower trace anion (e.g., Cl-,PO33-) contamination than Industry
Standards. Lower ion contamination provides superior performance in many analytical techniques, especially electrochemistry.
Performance in biological applications is enhanced with J.T.Baker’s low trace metal content (metals alter the activity of biomolecules).
Additionally, J.T.Baker’s high assay specification provides valuable purity information to assist in making precise buffer solutions.
Description:
Odorless, white powder.
Manufacturing Process:
Reagent grade Sodium Sulfate is manufactured via solution chemistry. Reagent grade Sulfuric Acid and Reagent grade Sodium
Hydroxide are combined in a stainless steel reactor. The resulting solution is filtered and passed to a steam jacketed evaporator,
where the solution is dried to form the anhydrous powder. The powder is then blended and ground for homogeneity into 5–10,000
lb. lots.
Reaction: 2NaOH + H2SO4 → Na2SO4 + 2H2O
Helpful Hints for
Accurate Experiments:
Anhydrous Sodium Sulfate is very hygroscopic. When making up precise solutions (especially for protein precipitations and counter
ion chromatography), it is desirable to dry the Sodium Sulfate before weighing. Drying at 120°C for 2–4 hours is sufficient to return
the salt to the anhydrous form. Cool the dried powder in a desiccant before weighing.
Applications:
• Drying Agent
• Kjeldahl Analysis
• Buffers
• Polarography
• Environmental Analysis
Product Listing:
FW: 142.04
Product Number
3898
Size
Box Qty.
500 g
4 × 500 g
CAS Number: 7757-82-6
2.5 kg
12 kg
Availability:
Please contact your local J.T.Baker Distributor, or call 1-800-JTBAKER (1-800-582-2537). Fax 908-859-9318.
References
The Merck Index, 12, 8829, p. 1483, Merck & Co., Rahway, NJ (1996).
Reagent Chemicals, 7th Edition, pgs. 628-629, American Chemical Society, Washington, DC (1987).
Specifications
Product 3898 Sodium Sulfate, Anhydrous BAKER ANALYZED ACS Reagent Powder. Meets ACS Specifications
Test
BAR Specs
Typical
J.T.Baker
Analysis
ACS Standard
Assay
99.0% min.
99.9%
99.0% min.
Insoluble Matter
0.01%
<0.005%
0.01%
A cleanliness spec; Baker minimizes “floaters” that may interfere with
experiments when Sodium Sulfate is used as a buffer.
Loss on Ignition
0.5%
0.1%
0.5%
The loss on ignition specification serves as a criterion to determine the moisture
content of Sodium Sulfate.
pH of 5% Solution at
25°C
5.2–9.2
6.3
5.2-9.2
The pH test monitors residual Sulfuric Acid or Sodium Hydroxide. The pH of a 5%
solution of pure Sodium Sulfate, Anhydrous should be 7.2 at 25°C.
Chloride (Cl)
0.001%
0.0005%
0.001%
Chloride is a competing anion to Sulfate and can interfere in polarographic
techniques.
Phosphate
0.001%
0.001%
0.001%
Phosphate is another competing cation that can interfere in buffer and
electrochemical applications.
Nitrogen Compounds
(as N)
5 ppm
5 ppm
5 ppm
Nitrogen compounds can be introduced with the Sodium Hydroxide feedstock.
We minimize these competing ions to provide more consistent performance
in buffer and electro-chemical applications. Low Nitrogen is also critical for
Kjeldahl Analysis.
Heavy Metals (as Pb)
5 ppm
3 ppm
5 ppm
* Iron (Fe)
0.001%
J.T.Baker monitors levels of heavy metals (Ag, As, Bi, Cd, Cu, Hg, Mo, Pb, Sb, and
Sn), as well as iron. Controlling the level of metals is extremely important to all
biological work. Metals alter the activity of sensitive biological molecules.
Calcium
0.01%
< 0.005%
0.01%
Magnesium
0.005%
< 0.005%
0.005%
* Potassium
0.01%
0.0003%
0.01%
10 ppm
High assay assures that the hydrated form of the chemical is minimized.
Knowing the assay is important when making up precise solutions and when
using the regent as a drying agent.
These common impurities can be introduced from the Sodium Hydroxide
feedstock. This test assures they have been minimized and allows for less
variation in reagent performance.
* Specifications where ‘BAKER ANALYZED’® Sodium Sulfate exceeds Industry Standards.
For Laboratory, Research or Manufacturing Use.
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