Na2SO3 (aq) + 2 HF (aq) → 2 NaF (aq) + SO2 (aq) + H2O (l)

This is an acid-base reaction (neutralization): Na2SO3 is a base, HF is an acid.

Reactants:

  • Na2SO3 – Sodium sulfite source: wikipedia, accessed: 2019-09-28source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04
    • Other names: Sodium sulphite source: wikipedia, accessed: 2019-09-28source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Hypo clear (photography) source: wikipedia, accessed: 2019-09-28, E221 source: wikipedia, accessed: 2019-09-28
    • Appearance: White solid source: wikipedia, accessed: 2019-09-28; White crystals or powder source: ICSC, accessed: 2019-09-04
  • HF – Fluorane source: wikipedia, accessed: 2019-09-27source: wikipedia, accessed: 2019-09-27
    • Other names: Hydrofluoric acid source: wikipedia, accessed: 2019-09-27source: NIOSH NPG, accessed: 2019-09-02, Hydrogen fluoride source: wikipedia, accessed: 2019-09-27source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Fluorhydric acid source: wikipedia, accessed: 2019-09-27
    • Appearance: Colorless solution source: wikipedia, accessed: 2019-09-27; Colourless gas or colourless liquid (below 19.5 °C) source: wikipedia, accessed: 2019-09-27; Colourless gas or colourless fuming liquid with pungent odour source: ICSC, accessed: 2019-09-04; Colourless fuming liquid with pungent odour source: ICSC, accessed: 2019-09-04; Colorless gas or fuming liquid (below 67°F) with a strong, irritating odor. [Note: Shipped in cylinders.] source: NIOSH NPG, accessed: 2019-09-02

Products:

  • NaF – Sodium fluoride source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04
    • Other names: Florocid source: wikipedia, accessed: 2019-09-27, Sodium fluoride (as F) source: NIOSH NPG, accessed: 2019-09-02, Floridine source: wikidata, accessed: 2019-09-02source: NIOSH NPG, accessed: 2019-09-02
    • Appearance: White to greenish solid source: wikipedia, accessed: 2019-09-27; White crystals or powder source: ICSC, accessed: 2019-09-04; Odorless, white powder or colorless crystals. [Note: Pesticide grade is often dyed blue.] source: NIOSH NPG, accessed: 2019-09-02
  • SO2 – Sulfur dioxide source: wikipedia, accessed: 2019-09-28source: wikidata, accessed: 2019-09-02source: NIOSH NPG, accessed: 2019-09-02
    • Other names: Sulfurous anhydride source: wikipedia, accessed: 2019-09-28source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Sulphur dioxide source: ICSC, accessed: 2019-09-04source: wikidata, accessed: 2019-09-02, Sulfurous acid anhydride source: wikidata, accessed: 2019-09-02source: NIOSH NPG, accessed: 2019-09-02
    • Appearance: Colorless gas source: wikipedia, accessed: 2019-09-28; Colourless gas or compressed liquefied gas with pungent odour source: ICSC, accessed: 2019-09-04; Colorless gas with a characteristic, irritating, pungent odor. [Note: A liquid below 14°F. Shipped as a liquefied compressed gas.] source: NIOSH NPG, accessed: 2019-09-02
  • H2O – Water, oxidane source: wikipedia, accessed: 2019-09-27
    • Other names: Water (H2O) source: wikipedia, accessed: 2019-09-27, Hydrogen hydroxide (HH or HOH) source: wikipedia, accessed: 2019-09-27, Hydrogen oxide source: wikipedia, accessed: 2019-09-27
    • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas source: wikipedia, accessed: 2019-09-27