Lecture%204%20part%20II%20Chem%20102

Lecture%204%20part%20II%20Chem%20102 - Chapter 4 Types of...

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Chapter 4 Types of Chemical Reactions Part II
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Types of Chemical Reactions Precipitation Reactions Acid–Base Reactions Oxidation–Reduction Reactions
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Precipitation Reaction Precipitation reaction or double displacement reaction in which a solid forms and separates from the solution. When ionic compounds dissolve in water, the resulting solution contains the separated ions. Precipitate – the solid that forms (insoluble substance)
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Precipitation Reaction Ba(NO 3 ) 2 ( aq ) and K 2 CrO 4 ( aq ) ?????? Ba(NO 3 ) 2 ( aq ) Ba 2+ (aq) + 2NO 3 (aq) K 2 CrO 4 ( aq ) 2K + (aq) + CrO 4 2- (aq) Soluble in water Formation of ions
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Precipitation Reaction Formation of solid – yellow precipitate Ba 2+ (aq) + 2NO 3 (aq) + 2K + (aq) + CrO 4 2- (aq) ?????? Which ions are combining to for the product ?? + and - KNO 3 and BaCrO 4
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Precipitation Reaction KNO 3 and BaCrO 4 Which one is insoluble (solid)? Yellow color indicates formation of CrO 4 2- ions BaCrO 4 solid product We can write the chemical equation Ba(NO 3 ) 2 ( aq ) and K 2 CrO 4 ( aq ) BaCrO 4 (s) + 2KNO 3 (aq)
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Precipitation Reaction Formula equation Ba(NO 3 ) 2 ( aq ) and K 2 CrO 4 ( aq ) BaCrO 4 (s) + 2KNO 3 (aq) Complete ionic equation Ba 2+ (aq) + 2NO 3 (aq) + 2K + (aq) + CrO 4 2- (aq) BaCrO 4 (s) + 2K + + 2NO 3 - (aq) Spectator ions Net ionic equation Ba 2+ (aq) + CrO 4 2- (aq) BaCrO 4 (s)
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