ferric oxide

noun

, Chemistry.

a dark-red, crystalline, water-insoluble solid, Fe 2 O 3 , occurring naturally, as hematite and rust, or synthesized: used chiefly as a pigment, as a mordant, as a coating for magnetic recording tape, and in the manufacture of polishing compounds.

ferric oxide

a red crystalline insoluble oxide of iron that occurs as haematite and rust and is made by heating ferrous sulphate: used as a pigment and metal polish ( jeweller's rouge ), and as a sensitive coating on magnetic tape. Formula: Fe 2 O 3 Systematic nameiron (III) oxide

ferric oxide

A reddish-brown to silver or black compound which occurs naturally as the mineral hematite and as rust. It is often used as a pigment and a metal polish. Chemical formula: Fe 2 O 3 .

First recorded in 1880–85

In some species colouring matter or ferric oxide is stored in the capsule.

When further ignition ceases to cause a loss of weight, the residue is ferric oxide (Fe2O3), which contains 70 per cent.

The difference between this weight and that of the combined oxides gives the ferric oxide and alumina.

It is a common practice to determine the iron, calculate it to ferric oxide, and so to estimate the alumina indirectly.

Calculate the percentage as ferrous oxide, unless there are reasons to the contrary, also calculate its weight as ferric oxide.

April 25, 2024firkin

[fur-kin ]

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