Sodium Bicarbonate Solution: A Pathway to Sodium Hydrosulfide

Anhydrous sodium hydrosulfide

Prepared as described above under strict moisture-free conditions.

Aqueous NaHS Solution

Sodium sulfide nonahydrate (Na₂S·9H₂O) is dissolved in freshly distilled water to make a 13% (w/v) Na₂S solution.

Under stirring and below 20°C, 14 g NaHCO₃ is added to 100 mL of this solution, causing immediate dissolution and exothermic reaction.

100 mL methanol is then added (keeping temperature <20°C), precipitating Na₂CO₃ crystals.

After 10 min, the mixture is filtered, and the residue is washed with 50 mL methanol.

The filtrate contains ≥9 g NaHS and ≤0.6 g Na₂CO₃ (~3.5 g NaHS and 0.2 g Na₂CO₃ per 100 mL).

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