タイトルまたは説明

Borax BP

Borax BP; Sodium Borate; Sodium Tetraborate
MF Na2B4O7,*0H2O *-M.wt **1.4 *- cas# ********4

DEFINITION
Borax contains not less than *9.0 per cent and not more than the equivalent of **3.0  per cent of disodium tetraborate decahydrate.

CHARACTERS
A white, crystalline powder, colourless crystals or crystalline masses, efflorescent, soluble in water, very soluble in boiling water, freely soluble in glycerol.

IDENTIFICATION
A. To 1 ml of solution S (see Tests) add 0.1 ml of sulphuric acid and 5 ml of methanol \ and ignite. The flame has a green border.
B. To 5 ml of solution S add 0.1 ml of phenolphthalein solution. The solution is red. On the addition of 5 ml of glycerol (*5 per cent) the colour disappears.
C. Solution S gives the reactions of sodium.

TESTS
Solution S
Dissolve 4.0 g in carbon dioxide-free water prepared from distilled water and  dilute to **0 ml with the same solvent.
Appearance of solution
Solution S is clear and colourless.
pH
The pH of solution S is 9.0 to 9.6.
Sulphates
*5 ml of solution S complies with the limit test for sulphates (*0 ppm).
Ammonium
6 ml of solution S diluted to *4 ml with water complies with the limit test for  ammonium (*0 ppm).
Arsenic
5 ml of solution S complies with limit test A for arsenic (5 ppm).
Calcium
*5 ml of solution S complies with the limit test for calcium (**0 ppm).
Heavy metals
*2 ml of solution S complies with limit test A for heavy metals (*5 ppm).

Sodium Borate USP NF

Sodium Borate USP-NF; Borax USP NF
Na2B4O***0H2O **1.*7
Borax
Borax [********4]
Anhydrous **1.*2 [********4]

Sodium Borate contains an amount of Na2B4O7 equivalent to not less than *9.0 percent and not more than **5.0 percent of Na2B4O7·*0H2O.

Identification— A solution (1 in *0) responds to the tests for Sodium and for Borate.
Carbonate and bicarbonate— To 5 mL of a solution (1 in *0), contained in a test tube, add 1 mL of 3 N hydrochloric acid: no effervescence is observed.
Heavy metals— the limit is 0.**2%.

Sodium Borate Decahydrate or Borax ACS Analytical Reagent

Sodium Tetraborate Decahydrate ACS
Na2B4O7 **0H2O
Formula Wt **1.*7
CAS Number ********4

REQUIREMENTS
Assay: *9.****5.0% Na2B4O***0H2O
pH of a 0.*1 M solution: 9.***9.*0 at *5C

MAXIMUM ALLOWABLE
Insoluble matter ........... 0.**5%
Chloride (Cl) ............... 0.**1%
Phosphate (PO4) ......... 0.**1%
Sulfate (SO4) .............. 0.**5%
Calcium (Ca) ............... 0.**5%
Heavy metals (as Pb) ... 0.**1%
Iron (Fe) ..................... 5 ppm