net ionic equations. aqueous solutions of sodium hydroxide and copper (ii) chloride combine to form...

Net Ionic Equations

Aqueous solutions of Sodium Hydroxide and Copper (II) Chloride combine to form an aqueous solution of sodium chloride and solid blue Copper

Hydroxide

1. Write a skeleton equation2. Balance the equation.3. Identify the spectator ions.4. Write the total ionic equation.5. Write the net ionic equation.

Aqueous solutions of Sodium Hydroxide and Copper (II) Chloride combine to form an aqueous solution of sodium chloride and solid blue Copper Hydroxide

Na(OH)(aq) + CuCl2(aq)

Na+

1

OH -1

Cu+

2Cl -1

Cl -1

Na(OH)(aq) + CuCl2(aq) NaCl(aq) + Cu(OH)2 (s)

Na+

1

OH -1

Cu+

2

Cl -1

Cl -1

The Copper and Hydroxide Join to form solid Copper Hydroxide

Equation Not Balanced

PrecipitateOH

-1

Na(OH)(aq) + CuCl2(aq) NaCl(aq) + Cu(OH)2 (s)

Balance the skeleton Equation

Na O H Cu Cl Na O H Cu Cl

Na(OH)(aq) + CuCl2(aq) NaCl(aq) + Cu(OH)2 (s)

Balance the skeleton Equation

Na O H Cu Cl Na O H Cu Cl

1 1 1 1 2 1 2 2 1 1

2Na(OH)(aq) + CuCl2(aq) NaCl(aq) + Cu(OH)2 (s)

Balance the skeleton Equation

Na O H Cu Cl Na O H Cu Cl

1 1 1 1 2 1 2 2 1 1

2 2 2 1 2 1 2 2 1 1

2Na(OH)(aq) + CuCl2(aq) 2NaCl(aq) + Cu(OH)2 (s)

Balanced Molecular Formula

Na O H Cu Cl Na O H Cu Cl

1 1 1 1 2 1 2 2 1 1

2 2 2 1 2 1 2 2 1 1

2 2 2 1 2 2 2 2 1 2

Spectator Ions? They don’t take part in the reaction.

Na+

1

OH -1 Cu+

2

Cl -1OH

-1

Cl -1Na+

1

OH -1

Na+

1 Cl -1

Na+

1 Cl -1 OH -1

Cu+

2

Na+

1

OH -1

Cu+

2

Cl -1

Cl -1

OH -1

Na+

1Na+

1

OH -1

Cu+

2

Cl -1

Cl -1

OH -1

Na+

1

WRITING TOTAL AND NET IONIC EQUATIONS

1. Balanced molecular equation.2. Disassociate the aqueous ionic compounds

(strong electrolytes) indicating the correct formula, number and charge of each.

3. Bring down all compounds with (s), (l), or (g) unchanged.

4. This is a total Ionic Equation. For a net ionic equation cross out the spectator ions.

2Na(OH)(aq) + CuCl2(aq) 2NaCl(aq) + Cu(OH)2 (s)

1. Balanced molecular equation.2. Disassociate the aqueous ionic compounds (strong

electrolytes) indicating the correct formula, number and charge of each.

3. Bring down all compounds with (s), (l), or (g) unchanged.4. This is a total Ionic Equation. For a net ionic equation cross

out the spectator ions.

2Na(OH)(aq) + CuCl2(aq) 2NaCl(aq) + Cu(OH)2 (s)

2Na1+(aq) + 2(OH)1-

(aq) + Cu2+

(aq) + 2Cl1-

(aq) 2Na1+

(aq) + 2Cl1-

(aq) + Cu(OH)2(s)

1. Balanced molecular equation.2. Disassociate the aqueous ionic compounds (strong

electrolytes) indicating the correct formula, number and charge of each.

3. Bring down all compounds with (s), (l), or (g) unchanged.4. This is a total Ionic Equation. For a net ionic equation cross

out the spectator ions.

2Na(OH)(aq) + CuCl2(aq) 2NaCl(aq) + Cu(OH)2 (s)

2Na1+(aq) + 2(OH)1-

(aq) + Cu2+

(aq) + 2Cl1-

(aq) 2Na1+

(aq) + 2Cl1-

(aq) + Cu(OH)2(s)

1. Balanced molecular equation.2. Disassociate the aqueous ionic compounds (strong

electrolytes) indicating the correct formula, number and charge of each.

3. Bring down all compounds with (s), (l), or (g) unchanged.4. This is a total Ionic Equation. For a net ionic equation cross

out the spectator ions.

2Na(OH)(aq) + CuCl2(aq) 2NaCl(aq) + Cu(OH)2 (s)

2Na1+(aq) + 2(OH)1-

(aq) + Cu2+

(aq) + 2Cl1-

(aq) 2Na1+

(aq) + 2Cl1-

(aq) + Cu(OH)2(s)

1. Balanced molecular equation.2. Disassociate the aqueous ionic compounds (strong

electrolytes) indicating the correct formula, number and charge of each.

3. Bring down all compounds with (s), (l), or (g) unchanged.4. This is a total Ionic Equation. For a net ionic equation cross

out the spectator ions.

2Na(OH)(aq) + CuCl2(aq) 2NaCl(aq) + Cu(OH)2 (s)

2Na1+(aq) + 2(OH)1-

(aq) + Cu2+

(aq) + 2Cl1-

(aq) 2Na1+

(aq) + 2Cl1-

(aq) + Cu(OH)2(s)

1. Balanced molecular equation.2. Disassociate the aqueous ionic compounds (strong

electrolytes) indicating the correct formula, number and charge of each.

3. Bring down all compounds with (s), (l), or (g) unchanged.4. This is a total Ionic Equation. For a net ionic equation cross

out the spectator ions.

2Na(OH)(aq) + CuCl2(aq) 2NaCl(aq) + Cu(OH)2 (s)

2Na1+(aq) + 2(OH)1-

(aq) + Cu2+

(aq) + 2Cl1-

(aq) 2Na1+

(aq) + 2Cl1-

(aq) + Cu(OH)2(s)

TOTAL IONIC EQUATION1. Balanced molecular equation.

2. Disassociate the aqueous ionic compounds (strong electrolytes) indicating the correct formula, number and charge of each.

3. Bring down all compounds with (s), (l), or (g) unchanged.4. This is a total Ionic Equation. For a net ionic equation cross

out the spectator ions.

2Na(OH)(aq) + CuCl2(aq) 2NaCl(aq) + Cu(OH)2 (s)

2Na1+(aq) + 2(OH)1-

(aq) + Cu2+

(aq) + 2Cl1-

(aq) 2Na1+

(aq) + 2Cl1-

(aq) + Cu(OH)2(s)

Net IONIC EQUATION?1. Balanced molecular equation.

2. Disassociate the aqueous ionic compounds (strong electrolytes) indicating the correct formula, number and charge of each.

3. Bring down all compounds with (s), (l), or (g) unchanged.4. This is a total Ionic Equation. For a net ionic equation cross

out the spectator ions.

2Na(OH)(aq) + CuCl2(aq) 2NaCl(aq) + Cu(OH)2 (s)

2Na1+(aq) + 2(OH)1-

(aq) + Cu2+

(aq) + 2Cl1-

(aq) 2Na1+

(aq) + 2Cl1-

(aq) + Cu(OH)2(s)

Net IONIC EQUATION

1. Balanced molecular equation.2. Disassociate the aqueous ionic compounds (strong

electrolytes) indicating the correct formula, number and charge of each.

3. Bring down all compounds with (s), (l), or (g) unchanged.4. This is a total Ionic Equation. For a net ionic equation cross

out the spectator ions.

2(OH)1-(aq)

+ Cu2+(aq) Cu(OH)2(s)

ANOTHER EXAMPLE

BaCl2(aq)

BaCl2(aq) + Na2(SO4)

BaCl2(aq) + Na2(SO4) 2NaCl(aq)

BaCl2(aq) + Na2(SO4) 2NaCl(aq) + BaSO4(s)

BaCl2(aq) + Na2(SO4)(aq) 2NaCl(aq) + BaSO4(s)

BALANCED MOLECULAR FORMULA

1. Balanced molecular equation.2. Show the disassociated ions individually.3. Bring down all compounds with (s), (l), or (g) unchanged.4. Cross out the spectator ions.

BaCl2(aq) + Na2(SO4)(aq) 2NaCl(aq) + BaSO4(s)

BALANCED MOLECULAR FORMULA

Ba2+(aq) + 2Cl1-

(aq) + 2Na1+(aq) + SO4

2-(aq) 2Na1+

(aq) + 2Cl1-(aq) + BaSO4(s)

TOTAL IONIC EQUATION

1. Balanced molecular equation.2. Show the disassociated ions individually.3. Bring down all compounds with (s), (l), or (g) unchanged.4. Cross out the spectator ions.

BaCl2(aq) + Na2(SO4)(aq) 2NaCl(aq) + BaSO4(s)

BALANCED MOLECULAR FORMULA

Ba2+(aq) + 2Cl1-

(aq) + 2Na1+(aq) + SO4

2-(aq) 2Na1+

(aq) + 2Cl1-(aq) + BaSO4(s)

TOTAL IONIC EQUATION

Ba2+(aq) + 2Cl1-

(aq) + 2Na1+(aq) + SO4

2-(aq) 2Na1+

(aq) + 2Cl1-(aq) + BaSO4(s)

CROSS OUT SPECTATOR IONS

1. Balanced molecular equation.2. Show the disassociated ions individually.3. Bring down all compounds with (s), (l), or (g) unchanged.4. Cross out the spectator ions.

BaCl2(aq) + Na2(SO4)(aq) 2NaCl(aq) + BaSO4(s)

BALANCED MOLECULAR FORMULA

Ba2+(aq) + 2Cl1-

(aq) + 2Na1+(aq) + SO4

2-(aq) 2Na1+

(aq) + 2Cl1-(aq) + BaSO4(s)

TOTAL IONIC EQUATION

Ba2+(aq) + 2Cl1-

(aq) + 2Na1+(aq) + SO4

2-(aq) 2Na1+

(aq) + 2Cl1-(aq) + BaSO4(s)

CROSS OUT SPECTATOR IONS

Ba2+(aq) + SO4

2-(aq) BaSO4(s)

NET IONIC EQUATION1. Balanced molecular equation.2. Show the disassociated ions individually.3. Bring down all compounds with (s), (l), or (g) unchanged.4. Cross out the spectator ions.

Assignment

• An aqueous solution of aluminum chloride and sodium hydroxide react to form solid aluminum hydroxide.

1. Write a skeleton equation2. Balance the equation (molecular formula)3. Write the total ionic equation.4. Identify the spectator ions.5. Write the net ionic equation.