Friday, 30 September 2011

Calcium Carbonate - 99.9 % - CaCO3 - 200 g

Chemical formula: CaCO3

Synonyms: carbonate of calcium, chalk, limestone, calcite, marble.

Amount: 200 g

Appearance and odour: white powder without appreciable odour

Grade: 99.90 % pure.

Packaging: professional wide necked, white HDPE bottle with blue conical seal cap and tamper ring. Labelled. Bottle and cap are UN approved and reusable.

Description and uses: calcium carbonate is mostly found as limestone but at this purity this grade isn't any old piece of carbonaceous rock. This high grade is essentially free of alkali metal salts and produces a negative flame test for sodium.

An excellent source of other calcium salts, obtained by dissolving it in the according acid (carbon dioxide is the by-product).

Used analytically and quantitatively to fuse with minerals like Lepidolite to detect alkali metals like Lithium (Li), Rubidium (Rb) and Cesium (Cs). A highly pure calcium carbonate grade is necessary here to avoid sample contamination with alkali metal salts.

An interesting demonstration is that heated to very high temperature (over 1,000 celsius), calcium carbonate starts emitting light and losing carbon dioxide. The light was once referred to as 'lime light', a source of light now no longer in use. Prolonged heating at this temperature also causes the calcium carbonate to be completely converted to calcium oxide (CaO), aka 'quick lime'. The process of 'burning lime' was introduced to the British Isles by the Romans. Treated with water, quick lime absorbs water and is converted to calcium hydroxide (Ca(OH)2) aka 'slaked lime' in a process that can be violent and generates much heat. Slaked lime remains the basis for many mortars and cements since Roman times.

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CAS: 471-34-1

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