Sodium bisulfate - NaHSO<sub>4</sub>

What is Sodium bisulfate?

NaHSO4 is a sodium salt of the bisulfate anion with chemical name Sodium bisulfate. It is also called Sodium acid sulfate or Bisulfate of soda or Sodium hydrosulfate. In its anhydrous form, it is hygroscopic. The solutions are acidic with a pH value of 1 for every 1M solution.

Sodium acid sulfate is a dry granular compound white in colour. It dissolves in water and is corrosive to tissues and metals.

Properties of Sodium bisulfate – NaHSO4

NaHSO4

Sodium bisulfate

Molecular weight of NaHSO4

120.06 g/mol (anhydrous)

Density of Sodium bisulfate

2.742 g/cm3 (anhydrous)

Boiling point of Sodium bisulfate

Decomposes at 315 °C

Melting point of Sodium bisulfate

58.5 °C

Sodium bisulfate structure – NaHSO4

Structure of Sodium bisulfate

The exact mass and the monoisotopic mass of Sodium acid sulfate is 119.949 g/mol. The number of hydrogen bond acceptors equals to four and the number of hydrogen bond donor equals to one. This compound is canonicalized and has two covalently bonded unit.

NaHSO4 Uses (Sodium bisulfate)

  • Sodium bisulfate is used to lower the pH of water in swimming pools.
  • Used in metal finishing.
  • Used in the chicken house to reduce the concentration of Salmonella.
  • Used as a bleaching agent.
  • Used as a catalyst.
  • Used in the manufacturing of paper products.
  • Used in the water treatment products.
  • Used in paints.
  • Used in agricultural chemicals.
  • Used in velvet cloths.

Production of Sodium bisulfate

At an industrial scale Bisulfate of soda is obtained as an intermediate via Mannheim process which involves the reaction of sodium chloride (NaCl) and sulfuric acid (H2SO4):

NaCl + H2SO4 → HCl + NaHSO4

The above reaction is an extremely exothermic reaction. The liquid NaHSO4 produced is sprayed and allowed to cool to form a solid bead.

Chemical reactions of Sodium bisulfate:

At 58 °C the hydrated sodium bisulfate dehydrates and separates from the water molecule which is attached to it. It is allowed to cool. Heating it to 280 °C gives sodium pyrosulfate which is a colourless salt:

2 NaHSO4 → Na2S2O7 + H2O

Health hazards

Sodium hydrosulfate is a toxic, corrosive and non-combustible compound. Inhaling, swallowing or skin contact causes severe injury or leads to death. Oh heating, it liberates irritating and toxic gases.

Learn more about the Structure, physical and chemical properties of NaHSO4 from the experts at BYJU’S.

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