Typically ranges between 3.0 and 5.0 for a 5% or 50g/L solution.
The standard is currently active and has been updated with several amendments (No. 1, 2, 3). Molecular Weight: Approximately 228.20 g/mol. Technical Specifications (GOST 20478-75)
Typically requires high purity, often around 98-99.9%.
The standard limits the mass fractions of water-insoluble substances, residue after ignition, heavy metals, and manganese.
A white crystalline powder that is highly soluble in water.