Product Profile-jtbaker Sodium Phosphate-3042.pdf

ProductProfile Sodium Phosphate, Dibasic, Anhydrous (Disodium Hydrogen Phosphate) BAKER ANALYZED® ACS Reagent Suitable for Buffer Solutions Product Number 3828

Na2HPO4

THE BAKER ADVANTAGE:

BAKER ANALYZED® Sodium Phosphate, Dibasic Anhydrous undergoes more stringent testing than required by Industry Standards. Arsenic and Iron are critical specifications where BAKER ANALYZED Sodium Phosphate, Dibasic surpasses Industry Standards. Additionally, Baker phosphates are known among scientists to be low in trace insoluble matter that can interfere in buffer solution applications. High assay, low iron, and minimal insolubles lead to more consistent experimental performance.

Description:

A hygroscopic white powder that will absorb moisture from the air (to form a dihydrate or heptahydrate). Very soluble in water.

Manufacturing Process:

Sodium Phosphates are manufactured by reacting phosphoric acid with sodium carbonate. The resulting solution is filtered to remove silica, iron and other phosphates. The solution proceeds to a crystallizer to precipitate out the sodium phosphate, dibasic. The crystals are then centrifuged and the mother liquor is returned to the reactor. The crystals, currently in a 12-hydrate form, are dried to produce the anhydrous salt.

Helpful Hints for Accurate Experiments:

Since the anhydrous form of dibasic sodium phosphate is very hygroscopic, it is desirable to dry it before weighing when precise quantitation is important. Drying at 120° C for 2–4 hours will be sufficient to return the salt to the anhydrous form. Cool the dried powder in a desiccant before weighing.

Applications:

• Polarography • Chromatography • Buffer Solutions • Diagnostics

Product Listing:

FW: 141.96

Product Number 3828

CAS Number: 7558-79-4

Size

Box Qty

500 g

4 x 500 g

2.5 kg

4 x 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, 11th Edition, pg. 1366, Merck & Co., Rahway, NJ (1989). Faith, Keye’s and Clark’s Industrial Chemicals, Lowenheim and Moran, 4th Edition, pp. 746-754, John Wiley & Sons, New York (1975).

Specifications Product 3828 Sodium Phosphate, Dibasic, Anhydrous BAKER ANALYZED ACS Reagent. Meets ACS Specifications.Meets Reagent Specifications for testing USP/NF monographs

Test

BAR Specs

Typical J.T.Baker Analysis

Industry Standards

Assay

99.0% min.

99.1%

99.0% min.

Phosphorous pentoxide, sodium oxide and other phosphates are co-produced with the dibasic sodium phosphate. Consistent high assay assures that co-produced contaminants have been removed.

Insoluble Matter

0.01%

0.006%

0.006%

Sodium phosphate, dibasic is commonly used in buffer solutions. Therefore, insoluble matter is extremely important to minimize because insolubles may clog filters and interfere with analysis.

Loss on Drying at 105°C

0.2%

0.03%

0.2%

The higher the loss on drying, the greater the water content. Minimizing loss on drying assures the integrity of the chemical has been maintained.

pH of 5% Solution at 25°C

8.7–9.3

9.1

8.7–9.3

pH is checked to assure suitability in various biological and diagnostic solution applications.

Chloride

0.002%

<0.001%

0.002%

Chloride ions compete with phosphate and can interfere in biological applications. Low chloride assures more consistent results.

Sulfate

0.005%

<0.005%

0.005%

Sulfate will compete with phosphate in buffer applications, causing irreproducible results.

Heavy Metals (as Pb)

0.001%

<0.0005%

0.001%

As, Ag, Bi, Cd, Cu, Hg, Ma, Pb, Sb, and Sn are analyzed. Heavy metals render many biological systems inactive and are important to minimize.

Iron

0.002%

<0.0005%

0.002%

Iron is a common impurity in sodium phosphate. Lower iron assures better reproducibility when Sodium Phosphate is used in biological work.

For Laboratory, Research or Manufacturing Use.

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