Podcast 7.5 Molecular, Complete Ionic, and Net Ionic Equations

Podcast 7.5Molecular,

Complete Ionic, and Net Ionic Equations

Forming Ions

• Ionic (i.e. ________) refers to positive ion and negative ion

• Usually this is a metal + non-metal or metal + polyatomic ion

– Examples: NaCl, NaClO3, Li2CO3

• Polyatomic ions are listed on your naming card

What it Means to be “Dissolved,” (aq)

• (aq) means ___________ (dissolved in water)• For salts (aq) means the salt exists as _____• NaCl(aq) is the same as: Na+(aq) + Cl–(aq)• Acids form ions: HCl(aq) is H+(aq) + Cl–(aq),

Bases form ions: NaOH(aq) is Na+ + OH–

http://www.northland.cc.mn.us/biology/biology1111/animations/dissolve.html

The Solubility RulesNa-Cl-NO-SO-OH

Na Cl NO3 SO4 OH

Circle all the ionic compounds that are INSOLUBLE (these are the precipitates)

MgF2 CuSO4 NH4Cl Fe(OH)3 CsF

AgCl CdS CuF2 PbSO4 Ba(OH)2

Na2SO4 NH4OH Sr(NO3)2 Hg2I2 Na2CrO4

BaCO3 PbBr2 CaC2O4 HC2H3O2 MgO

Practice with writing ions

Q - Write ions for Na2CO3(aq)

A - 2Na+(aq) + CO32–(aq)

Notice that when ions form from molecules, charge can be separated, but the total charge (and number of each atom) stays constant.

Practice Writing Ions Example 1 Write ions for Ca3(PO4)2(aq) & Cd(NO3)2(aq)

Practice Writing Ions Example 2

Write ions for Na2S(aq) and Mg3(BO3)2(aq)

Types of chemical equationsEquations can be divided into 3 types

1) Molecular, 2) Complete Ionic, 3) Net ionic• Here is a typical molecular equation:Cd(NO3)2(aq) + Na2S(aq) CdS(s) + 2NaNO3(aq)

Complete Ionic Equation

Cd(NO3)2(aq) + Na2S(aq) CdS(s) + 2NaNO3(aq)

•We can write this as complete ionic equation – all compounds that are (aq) are written as ions

Net Ionic Equation

• To get the NET ionic equation we cancel out all terms that appear on both sides:

Cd2+(aq) + 2NO3–(aq) + 2Na+(aq) + S2–(aq)

CdS(s) + 2Na+(aq) + 2NO3

–(aq)

Equations must be balancedMaterials balance

Both sides of an equation should have the same number of each type of atom

Electrical balanceBoth sides of a reaction should have the same net charge

Example 3 When NaOH(aq) and MgCl2(aq) are mixed,

_______(s) and NaCl(aq) are produced.

Write balanced molecular, ionic & net ionic equations

Example 4Write the balanced net ionic equation

CuSO4(aq) + BaCl2(aq) CuCl2(aq) + BaSO4(s)

Example 5 Write the balanced net ionic equation

Fe(NO3)3(aq) + LiOH(aq) _____(aq) + Fe(OH)3(s)

Example 6Write the balanced net ionic equation

Na3PO4( ) + CaCl2( ) _____( ) + NaCl( )

Example 7Write the balanced net ionic equation

Na2S( ) + AgC2H3O2( ) ____( ) + Ag2S( )

Use the solubility rules to predict the products and write the net ionic

equation for the following reactions.Al (s) + H2SO4 (aq) →

Use the solubility rules to predict the products and write the net ionic

equation for the following reactions.HCl (aq) + Ba(OH)2 (aq) →