Synonyms: sodium hydrogen sulphate, acid sodium sulphate
Amount: 200 g
Appearance and odour: small white crystals without appreciable odour.
Packaging: professional wide necked, white HDPE bottle with blue conical seal cap and tamper ring. Labelled. Bottle and cap are UN approved and reusable.
Description and uses: sometimes referred to as 'the poor man's concentrated sulphuric acid’, sodium bisulphate can be used to fuse with materials (minerals, ores, oxides...) to digest them (for analysis or extraction), instead of the more hazardous and generally more expensive concentrated sulphuric acid. The higher melting point (315 Celsius) allows reaching higher temperatures of fusion than mere digestion with sulphuric acid alone. Also when added to concentrated sulphuric acid it increases the latter’s boiling point, thus enabling to reach higher temperatures during difficult digestions of inorganic materials.
Prolonged heating at boiling point causes dehydration with formation of sodium pyrosulphate (Na2S2O7), a precursor to sulphur trioxide.
In aqueous solution it behaves like a medium-strong acid and will easily dissolve the more reactive of metals. A solution of 120 g/L (1 M) has a pH of less than 1. The bisulphate anion has a pKa of 1.99.
Industrially it finds use as ‘pH down’ to decrease the pH of water in a variety of applications.
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