Warm Up Review Classify the type of reaction 1.AgNO 3 + NaCl  AgCl + NaNO PbO 2  2 PbO + O Al + 3 CuSO 4  Al 2 (SO 4 ) Cu Predict the products of the following reactions: 4.Zn + 2 AgNO 3  5.MgCl 2 + Ca(OH) 2  6.2Mg + O 2 

Warm Up Review Classify the type of reaction 1.AgNO 3 + NaCl  AgCl + NaNO 3 double displacement 2.2 PbO 2  2 PbO + O 2 decomposition 3. 2 Al + 3 CuSO 4  Al 2 (SO 4 ) Cu single displacement Predict the products of the following reactions: 4.Zn + 2 AgNO 3  Zn(NO 3 ) 2 + 2Ag 5.MgCl 2 + Ca(OH) 2  Mg(OH) 2 + CaCl 2 6.2Mg + O 2  2MgO

8.3 Reactions in Aqueous Solution

H2OH2O Water is a combination of two ions H + and OH - The reaction of ionic compounds in water (aqueous solution) allows the ionic compounds to disassociate in the solution. (aq) indicates that in solution the ions are formed AgNO 3 (aq) Ag + (aq) and NO 3 - (aq)

Some ions combine in solutions to form insoluble solids. These insoluble solids are called precipitates. Precipitates are indicated by (s) – They do not dissolve in solution to form ions Ag + + Cl -  AgCl (s)

Precipitates

Writing Complete Ionic Equations An equation that shows the dissolved ionic compounds (ie. The ions) Mg(NO 3 ) 2 (aq) + Na 2 CO 3 (aq)  MgCO 3 (s) + 2 NaNO 3 (aq)

Writing Complete Ionic Equations An equation that shows the dissolved ionic compounds (ie. The ions) Mg(NO 3 ) 2 (aq) + Na 2 CO 3 (aq)  MgCO 3 (s) + 2 NaNO 3 (aq) Mg 2+ (aq) ** Your turn- try to complete the rest of ionic eqaution!

Writing Complete Ionic Equations An equation that shows the dissolved ionic compounds (ie. The ions) Mg(NO 3 ) 2 (aq) + Na 2 CO 3 (aq)  MgCO 3 (s) + 2 NaNO 3 (aq) Mg 2+ (aq) + 2 NO 3 ¯ (aq) + 2 Na + (aq) + CO 3 2- (aq)  MgCO 3 (s) + 2 Na + (aq) + 2 NO 3 ¯ (aq)

Ions that appear on both sides of the equation are not directly involved in the reaction. They are called spectator ions Mg(NO 3 ) 2 (aq) + Na 2 CO 3 (aq)  MgCO 3 (s) + 2 NaNO 3 (aq) Mg 2+ (aq) + 2 NO 3 ¯ (aq) + 2 Na + (aq) + CO 3 2- (aq)  MgCO 3 (s) + 2 Na + (aq) + 2 NO 3 ¯ (aq)

The equation can be re-written with out the spectator ions. This is called a Net ionic equation. Mg(NO 3 ) 2 (aq) + Na 2 CO 3 (aq)  MgCO 3 (s) + 2 NaNO 3 (aq) Mg 2+ (aq) + 2 NO 3 ¯ (aq) + 2 Na + (aq) + CO 3 2- (aq)  MgCO 3 (s) + 2 Na + (aq) + 2 NO 3 ¯ (aq) Mg 2+ (aq) + CO 3 2- (aq)  MgCO 3 (s)

Predicting the formation of a Precipitate 1.Write the ions formed by your reactants 2.Identify how the ions (cations and anions) will rearrange 3.Look at table 8.3 (pg. 227) to see if the newly formed products are soluble – If they are soluble, that means they will dissolve into ions – If they are insoluble, they will be solids (precipitates)

Predicting the Formation of a Precipitate: Example SrBr 2 (aq) + K 2 SO 4 (aq)  First: Identify the Ions formed Sr 2+ (aq) + 2 Br¯ (aq) + 2 K + (aq) + SO 4 2- (aq)

Predicting the Formation of a Precipitate: Example SrBr 2 (aq) + K 2 SO 4 (aq)  First: Identify the Ions formed Sr 2+ (aq) + 2 Br¯ (aq) + 2 K + (aq) + SO 4 2- (aq) Second: Identify how the ions will rearrange SrSO 4 and KBr

Predicting the Formation of a Precipitate: Example SrBr 2 (aq) + K 2 SO 4 (aq)  First: Identify the Ions formed Sr 2+ (aq) + 2 Br¯ (aq) + 2 K + (aq) + SO 4 2- (aq) Second: Identify how the ions will rearrange SrSO 4 and KBr Third: Look at Table 8.3 to identify which compounds are soluble. – Notice the rule for sulfates (SO 4 ); soluble except when in compounds of Pb, Ag, Hg, Ba, Sr, and Ca – Notice the rule for salts of alkali metals and ammonia (they are soluble)

Predicting the Formation of a Precipitate: Example SrBr 2 (aq) + K 2 SO 4 (aq)  First: Identify the Ions formed Sr 2+ (aq) + 2 Br¯ (aq) + 2 K + (aq) + SO 4 2- (aq) Second: Identify how the ions will rearrange SrSO 4 (s) and KBr (aq) Third: Look at Table 8.3 to identify which compounds are soluble. – Notice the rule for sulfates (SO 4 ); soluble except when in compounds of Pb, Ag, Hg, Ba, Sr, and Ca – Notice the rule for salts of alkali metals and ammonia (they are soluble)

Lets re-write the net ionic equation using this information! Sr 2+ (aq) + 2 Br¯ (aq) + 2 K + (aq) + SO 4 (aq)  SrSO 4 (s) + 2 K + (aq) + 2 Br¯ (aq) Sr 2+ (aq) + SO 4 2- (aq)  SrSO 4 (s)

The End! Begin HW so that I am able to help you during class.