Dissociation and Neutralization

GLE 9.4.4

What is dissociation?The process by which an ionic compound

separates into its positive ions (cations) and negative ions (anions).

For exampleHF H+ + F-

Li2O Li+ + O2-

NaCl Na+ + Cl-

Dissociation of an AcidWhen an acid is added to water it separates into

its respective ions

For exampleHCl + H2O H+ + Cl- + H20 Cl- + H3O+

Dissociation of a BaseWhen a base is added to water, it separates into

its ions.

For exampleNaOH + H2O Na+ + OH- + H2O

LiOH + + H2O Na+ + OH- + H2O

What happens when you combine an acid and a base?

When an acid and base combine you are neutralizing the pH and water and salt are formed.

This process is referred to as neutralization.

For exampleHCl + NaOH NaCl+ H2O

HF + LiOH LiF + H2O

A salt doesn’t have to be NaCl, but any negative ions (anions) from an acid combining with postive ions (cations) from a base. Like LiF in the example above.

Let’s Review!______________ is the process by which an ionic

compound separates into its positive and negative ions.

Dissociation of _________ produces a negative ion (or an anion) and hydronium (H3O+)

Dissociation of __________ produces a positive ion (or a cation) and hydroxide (OH-)

When you combine an acid and a base you form _______ and a _________.

Let’s Review!Dissociation is the process by which an ionic

compound separates into its positive and negative ions.

Dissociation of an acid produces a negative ion (or an anion) and hydronium (H3O+)

Dissociation of a base produces a positive ion (or a cation) and hydroxide (OH-)

When you combine an acid and a base you form water and a salt.

What’s actually happening during neutralization

Watch the video on you tube. NaCl when combine in water dissociate into their respective ions (Na+ and Cl-) since they do not have anything to do with the neutralization they are referred to as spectator ions.

http://www.youtube.com/watch?feature=player_detailpage&v=PCM5IwJ8wcs