Precipation reaction

A precipitation reaction forms an insoluble solid from species initially in solution. The solid is called a precipitate. Precipitation is the standard spelling for this chemistry term.

Meaning and context

In an introductory aqueous example, dissolved ions combine into a substance that is poorly soluble under the conditions. Solubility rules help predict some outcomes, but temperature, concentration, and the actual compounds also matter.

Examples and usage

A standard equation is Ag⁺(aq) + Cl⁻(aq) → AgCl(s). The solid label identifies the precipitate. The equation illustrates ionic bookkeeping and does not prescribe an experiment or handling procedure.

What to check

Not every cloudy mixture proves that a new solid formed by reaction. Undissolved starting material, bubbles, or an existing suspension can also affect appearance. Identify the substances and evidence rather than relying only on a visual change.

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