Precipitation Reaction Predictor

When two ionic solutions are mixed, a precipitation reaction occurs if the ions combine to form an insoluble solid — but predicting whether this happens requires knowing solubility rules. Select the cation and anion for your First Solution and Second Solution to get a Precipitation Prediction, plus the Complete Molecular Equation, Net Ionic Equation, Precipitate Formula, and the specific Solubility Rule Applied.

Results

Precipitation Prediction

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Complete Molecular Equation

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Net Ionic Equation

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Precipitate Formula

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Solubility Rule Applied

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Frequently Asked Questions

What is a precipitation reaction?

A precipitation reaction occurs when two aqueous solutions of ionic compounds are mixed and an insoluble solid (precipitate) forms. This happens when the product of mixing has low solubility in water.

How do solubility rules help predict precipitates?

Solubility rules are guidelines that tell us which ionic compounds are soluble or insoluble in water. By applying these rules to the products of a double displacement reaction, we can predict if a precipitate will form.

What is the difference between complete and net ionic equations?

Complete ionic equations show all ions present in solution, while net ionic equations only show the ions that participate in forming the precipitate. Spectator ions that don't react are omitted from net ionic equations.

Which compounds are always soluble in water?

Nitrates (NO₃⁻), acetates, and compounds containing alkali metals (Group 1) or ammonium (NH₄⁺) are generally always soluble in water according to solubility rules.

What makes silver compounds special in precipitation reactions?

Most silver compounds are insoluble in water, except for silver nitrate and silver acetate. This makes silver ions excellent for precipitation reactions with halides and other anions.

How do you balance precipitation equations?

Balance precipitation equations by ensuring equal numbers of each type of atom and equal charges on both sides. Start with the precipitate formula, then balance the spectator ions.