Why do precipitates form?
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Why do precipitates form? PowerPoint PPT Presentation


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Why do precipitates form?. Precipitates form because different ions are more strongly attracted to each other than to water molecules. Other ions are more attracted to water molecules this attraction causes ions to dissolve without forming a precipitate and are said to soluble.

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Why do precipitates form?

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Why do precipitates form

Why do precipitates form?

Precipitates form because different ions are more strongly attracted to each other than to water molecules.

Other ions are more attracted to water molecules this attraction causes ions to dissolve without forming a precipitate and are said to soluble


Why do precipitates form

Why do precipitates form?

For example in a solution of silver nitrate (AgNO3) silver ions (Ag+) and nitrate ions (NO3 -) are surrounded by water molecules

The same situation occurs in a sodium chloride solution.

A solution of silver nitrate

A solution of sodium chloride

Water molecules surrounding sodium and chloride ions

Water molecules surrounding nitrate and silver ions


Why do precipitates form

However when the NaCl and AgNO3 solutions are mixed the Ag+ ions and the Cl- ions are more strongly attracted to each other than they are to the water molecules this causes the two ions to come together to form an insolubleprecipitate of AgCl.

The Na+ and NO3- ions stay in solution and don’t take part in the reaction. They are called spectator ions

Ag+ and Cl- ions come together to form a precipitate


Why do precipitates form

Equation writing

Formal (or symbol) equations are equations where all atoms are included in the equation.

Eg Mg + 2HCl MgCl2 + H2


Why do precipitates form

Precipitation Equations

Require that the precipitate be identified.

Eg The AgCl precipitate formed from the addition of two AgNO3 and NaCl solutions. We would write the ionic equation as:

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

The subscripts:

(aq) stand for aqueous this means the ions are in a water solution and (s) stands for solid which means a precipitate has formed.


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