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A salt or ester of xanthic acid. Many xanthates have a yellow color. Xanthates are used as flotation agents in mineral processing.

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End Point

The point at which an indicator changes colour and a titration is stopped.

Fractional Distillation

The process in which a fractioning column is used in distillation apparatus to separate components of a liquid mixture that have different boiling points.

xylene

Any of three oily, colorless, water-insoluble, flammable, toxic, isomeric liquids, C8H10, of the benzene series, obtained mostly from coal tar: used chiefly in the manufacture of dyes.

Homologous Series

A series of compounds in which each member differs from the next by a specific number and kind of atoms.

Heterogeneous Catalyst

A catalyst that exists in a different phase (solid, liquid or gas) from the reactants, a contact catalyst.

Metallic Conduction

Conduction of electrical current through a metal or along a metallic surface.

Percent Purity

The percent of a specified compound or element in an impure sample.

Solute

The dispersed (dissolved) phase of a solution.

Semipermable Membrane

A thin partition between two solutions through which certain molecules can pass but others cannot.

Nuclides

Refers to different atomic forms of all elements in contrast to ?isotopes?, which refer only to different atomic forms of a single element.