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Sodium Bisulfite: Soda Solution Saturated with Sulphur Dioxide (Thorpe 1913)
Sodium bisulfite, NaHSO3, is a white powder smelling of sulphur dioxide, used as a reducing agent, as an antichlor and to make sodium hydrosulphite.
Thorpe's Dictionary of Applied Chemistry (1913) makes it by saturating a solution of sodium carbonate with sulphur dioxide (Na2CO3 + 2SO2 + H2O = 2NaHSO3 + CO2) and throwing it out of the solution with alcohol.
The amounts are our arithmetic from that equation; the water, the alcohol and the glassware are ours.
Source: Thorpe, Dictionary of Applied Chemistry vol. V (1913), SODIUM, p. 19. Picture: that page.
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