Precipitation Reactions

TEKS C.10(H) UNDERSTAND AND DIFFERENTIATE AMONG ACID -BASE

REACTIONS, PRECIPITATION REACTIONS, AND OXIDATION-REDUCTION REACTIONS.

Precipitation Reactions

Precipitation Reactions

Precipitation reactions result in the formation of an insoluble product, or precipitate. What is a precipitate?

This means…? Soluble or Insoluble?Soluble- dissolves in solutionInsoluble- does not dissolve in solution

Solid, precipitate

Precipitation Reactions tend to be

Double-Displacement Reactions Reminder- Cations switch partners with the anions.

Example:

NaCl(aq)+AgNO3(aq)NaNO3(aq)+AgCl(s)

The Process

Should always be given the reactants but may or may not be given the products so…

Predict products Determine solubility Soluble (aq) Insoluble (s)

Sample EOC question

Which of the following chemical reactions will produce a precipitate?

A. 3KBr+AlPO4K3PO4+AlBr3

B. ZnCl2+Mg2SO4ZnSO4+MgCl2

C. Na2CO3+CaCl2CaCO3+2NaCl

D. NH4OH+KClKOH+NH4Cl

Predicting Products

Write a balanced equation and Identify the precipitate that forms when the following solutions are mixed: KOH and Cu(NO3)2

KOH(aq)+Cu(NO3)2Cu(OH)2+ KNO3

Cu(OH)2(s) is the precipitate formed