Specification Test Results

• Meets ACS Reagent Chemical Requirements:
  —
• Assay (Na₂S₂O₃5H₂O) (by iodometry):
  99.5 - 101.0 %
• Insoluble Matter:
  = 0.005 %
• pH of 5% Solution at 25°C:
  6.0 - 8.4
• Nitrogen Compounds (as N):
  = 0.002 %
• Sulfate and Sulfite (as SO₄):
  = 0.1 %
• Sulfide (S):
  Passes Test
• Meets Reagent Specifications for testing USP/NF monographs:
  Passes Test