Uses
Sodium bisulfate is used for pickling metals; bleaching leather; carbonizing
wool; in carbonic acid baths, and manufacturing magnesia cements.
Production Methods
Sodium bisulfate is a by-product of sodium sulfate manufacture. One process involves reacting sulfuric acid with sodium nitrate at high temperature to form nitric acid and sodium bisulfate:
NaNO3 + H2SO4 → NaHSO4 + HNO3 (g)
In the above reaction, nitric acid is obtained as vapor. It is purged from the system and collected in water to obtain nitric acid solution of desired concentration. Sodium bisulfate is separated by fractional crystallization.
Chemical Properties
White colourless crystal
Uses
Magnesium nitrate hexahydrate may be used as a starting material for the synthesis of Mg-Al spinel precursors, required for the preparation of magnesium aluminate spinel (MgAl
2O
4) powder.
General Description
Magnesium nitrate hexahydrate is a hydrated magnesium salt. A mixture of magnesium nitrate hexahydrate and magnesium chloride hexahydrate has been reported as a potential phase change material (PCM) for the storage of latent thermal energy. It has been employed as a base material in this mixture to evaluate the storage and effective utilization of urban waste heat from emerged co-generation systems. Its crystals belong to the monoclinic crystal system.
Hazard
Low toxicity by ingestion. A mild skin and
eye irritant.
Purification Methods
Crystallise the nitrate from water (2.5mL/g) by partial evaporation in a desiccator. It is deliquescent and is soluble in EtOH. After two recrystallisations, ACS grade salt has: metal (ppm) Ca (6.2), Fe (8.4), K (2), Mo (0.6), Na (0.8), Se (0.02).
