Barium Nitrate

Barium Nitrate is an inorganic chemical compound with the formula Ba(NO₃)₂. It consists of one barium cation (Ba²⁺) and two nitrate anions (NO₃⁻).

Physical Properties

• Appearance: White, lustrous crystals or crystalline powder; colorless in pure form and odorless.
• Molar mass:261.34–261.337 g/mol.
• Density:3.24 g/cm³.
• Melting point: Around 590–610°C (it decomposes on strong heating rather than boiling).
• Solubility: Moderately soluble in water (about 9% at room temperature); insoluble in alcohol. It is slightly hygroscopic

It occurs naturally as the rare mineral nitrobarite.

Chemical Properties

Barium nitrate is a strong oxidizer. It does not burn on its own but intensifies combustion of other materials and can cause fires or explosions when mixed with combustibles, reducing agents, or finely divided metals. Upon heating, it decomposes as follows:

2 Ba(NO₃)₂ → 2 BaO + 4 NO₂ + O₂

It produces a characteristic bright green flame when burned, due to barium emission (often enhanced by chlorine donors forming BaCl species in the flame)

Uses

• Pyrotechnics and Fireworks: Primary use as an oxidizer and to produce green flames/colors in stars, flares, signal lights, and “green firecrackers.”
• Glass and Ceramics: Used in manufacturing certain glasses, ceramic glazes, and enamels.
• Other: In vacuum tubes, tracer bullets/primers/detonators, electronics, and as a precursor for other barium compounds (e.g., barium oxide).

Preparation

It is commonly manufactured by reacting barium carbonate (BaCO₃) with nitric acid, followed by filtration, evaporation, and crystallization. Another route involves barium sulfide with nitric acid or double displacement between barium chloride and sodium nitrate.