Dihydroxyaluminum sodium carbonate is an antacid. It is a basic inorganic salt that acts by neutralizing hydrochloric acid in gastric secretions. It exists as an amorphous powder or poorly formed crystal. Dihydroxyaluminum sodium carbonate is a medication used to treat heartburn.

Specifications of Dihydroxyaluminum Sodium Carbonate USP Grade:
NaAl(OH)2 CO3 --- 143.99
Aluminum, [carbonato(1-)-O]dihydroxy-, monosodium salt;
Sodium (T-4)-[carbonato(2-)-O,O']dihydroxyaluminate(1-);
Sodium (carbonato)dihydroxyaluminate(1-) CAS 539-68-4,16482-55-6.

Specifications of Dihydroxyaluminum Sodium Carbonate USP Grade:
NaAl(OH)2 CO3 --- 143.99
Aluminum, [carbonato(1-)-O]dihydroxy-, monosodium salt;
Sodium (T-4)-[carbonato(2-)-O,O']dihydroxyaluminate(1-);
Sodium (carbonato)dihydroxyaluminate(1-) CAS 539-68-4,16482-55-6.

DEFINITION
Dihydroxyaluminum Sodium Carbonate contains NLT 98.3% and NMT 107.9% of dihydroxyaluminum sodium carbonate [NaAl(OH)2 CO3], calculated on the dried basis.

IDENTIFICATION
A.
Sample solution: Combine 1 g with 20 mL of 3 N hydrochloric acid.
Acceptance criteria: The sample dissolves with effervescence.
B. Identification Tests: General, Aluminum: Meets the requirements
C. The Sample solution, prepared and tested as directed in the test for Sodium Content, exhibits a significant absorption at the sodium emission line at 589.0 nm.

ASSAY
To pass the test.
Acceptance criteria: 98.3% to 107.9% on the dried basis.

Mercury: To pass the test. Acceptance criteria: NMT 1 ppm.
Isopropyl Alcohol: To pass the test. Acceptance criteria: NMT 1.0%
Sodium Content: To pass the test. Acceptance criteria: 15.2% to 16.8%
Acid-Neutralizing Capacity: Sample: 425 mg of undried material Analysis: Proceed as directed using the Sample. Each mg of dihydroxyaluminum sodium carbonate [NaAl(OH)2 CO3] has an expected acid-neutralizing capacity of 0.0278 mEq. Acceptance criteria: NLT 75.0% of the expected mEq value, calculated in relation to the results of the Assay. pH: 9.9 to 10.2 in a suspension (1 in 25) Loss on Drying:
Sample: Dry at 130C to constant weight. Acceptance criteria: NMT 14.5%