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Sodium Hydroxide is a strong base in terms of chemical ionization and solutions of it can be assayed using a strong acid, such as Hydrochloric Acid or Sulfuric Acid, or by using an acidimetric standard such as Potassium Hydrogen Phthalate (KHP).
Test Name
Specification
Assay
Min. 97.0 %
Heavy Metals (as Ag)
Max. 0.002 %
Nitrogen Compounds (as N)
Max. 0.001 %
Phosphate (PO_4)
Sodium Carbonate (Na_2CO_3)
Max. 1.0 %
Sulfate (SO_4)
Max. 0.003 %
Magnesium (Mg)
Chloride (Cl)
Max. 0.005 %
Potassium (K)
Max. 0.02 %
Calcium (Ca)
Iron (Fe)
Nickel (Ni)
Mercury (Hg)
Max. 0.1 ppm