Double Replacement Reactions Ionic Cmpd(aq) + Ionic Cmpd(aq)

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Presentation transcript:

Double Replacement Reactions Ionic Cmpd(aq) + Ionic Cmpd(aq) Predicting Reaction Occurrence

What does it mean to be dissolved? When an Ionic Compound dissolves, it dissociates into separate ions K Cl - +

What causes an ionic cmpd to dissolve? Ionic Compound are held together by the electrostatic attraction of opposite charges K + Cl - Opposites Attract Attraction of Opposite Charges holds compound together

What causes an ionic cmpd to dissolve? The charged ends of the water molecules are also attracted to the charged ions and “pull” the oppositely charged ions apart - + - + K + Cl - Oxygen side is negatively charged Hydrogen side is positively charged

Two Ways to Write Saltwater Na+ Cl- Na+ Cl- Formula: NaCl(aq) Ionic: Na+ + Cl- Is this the same as NaCl(l) ?

+ NaCl(aq) MgSO4(aq) Na+ + Cl- + Mg+2 + SO4-2 Formula: Ionic: Na+ Cl-

Mg+2 Na+ Cl- SO4-2 Cl- Na+ Mg+2 SO4-2

Will These Combine? Mg+2 Na+ Cl- SO4-2 Cl- Na+ Mg+2 SO4-2

Will These Combine? Mg+2 Na+ Cl- SO4-2 Cl- Na+ Mg+2 SO4-2

Why did they bounce off each other? MgCl2 is soluble, so it stays dissolved Why did they bounce off each other? Will These Combine? Mg+2 Na+ Cl- SO4-2 Cl- Na+ Mg+2 SO4-2

Na2SO4 is soluble, so it stays dissolved Will These Combine? Mg+2 Na+ Cl- SO4-2 Cl- Na+ Mg+2 SO4-2

NaCl(aq) + MgSO4(aq) No Rxn All combinations are soluble Mg+2 Na+ Cl-

+ CaCrO4(aq) MgSO4(aq) + Mg+2 + SO4-2 Ca+2 + CrO4-2 Formula: Ionic:

Mg+2 Ca+2 CrO4-2 SO4-2 CrO4-2 Ca+2 Mg+2 SO4-2

Will These Combine? Mg+2 Ca+2 CrO4-2 SO4-2 CrO4-2 Ca+2 Mg+2 SO4-2

Will These Combine? Mg+2 Ca+2 CrO4-2 SO4-2 CrO4-2 Ca+2 Mg+2 SO4-2

Why did they bounce off each other? MgCrO4 is soluble, so it stays dissolved Why did they bounce off each other? Will These Combine? Mg+2 Ca+2 CrO4-2 SO4-2 CrO4-2 Ca+2 Mg+2 SO4-2

+ + CaCrO4(aq) MgSO4(aq) MgCrO4(aq) CaSO4(s) Spectator Ions Net Ionic CaSO4 is insoluble, so it forms a ___________ Mg+2 + CrO4-2 + Ca+2 + CrO4-2 Mg+2 + SO4-2 Precipitate + CaSO4(s) Spectator Ions Net Ionic Equation Ca+2 + SO4-2 CaSO4(s) Will These Combine? Mg+2 Ca+2 CrO4-2 SO4-2 CrO4-2 Ca+2 Mg+2 SO4-2

Your Turn Potassium phosphate(aq) + Barium chloride(aq)

Your Turn Include States in Formula Equation DR Lab: For Questions #1-3 Include States in Formula Equation Write Ionic and Net Ionic Equations

Useful Tip: Don’t let acids ‘bully’ you HCl Don’t let acids ‘bully’ you To take away their bullying power, call them by their ‘nerdy’ name Examples For hydrochloric acid, HCl – call it ________________ For sulfuric acid, H2SO4 – call it _____________ Hydrogen chloride Hydrogen sulfate

Double Replacement Rxns: Other Possibilities Not all combinations that are insoluble are solids Instead of Precipitates, we sometimes get Insoluble Liquids Gases Blue “Cheat Sheet” has list of common insoluble liquids and gases

Example of Non-Precipitate Potassium sulfite (aq) + nitric acid (aq)  Hydrogen nitrate

Assignment Get out Double Replacement Lab and Complete Pre-Lab Questions. Write Ionic and Net Ionic Equations for all reaction Complete back page on lab. HW: Pages 13 & 14