Lecture 4 part II Chem 102

Lecture 4 part II Chem 102 - Chapter 4 Types of Chemical...

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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. 1. Solution - when ionic compounds dissolve in water, the resulting solution contains the separated ions. 2. Precipitate – the solid that forms (insoluble substance)
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Ba(NO 3 ) 2 ( aq ) and K 2 CrO 4 ( aq ) ?????? Precipitation Reaction 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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Ba 2+ (aq) + 2NO 3 (aq) + 2K + (aq) + CrO 4 2- (aq) ?????? Precipitation Reaction Formation of solid – yellow precipitate Which ions are combining to form 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 ) + K 2 CrO 4 ( aq ) BaCrO 4 (s) + 2KNO 3 (aq)
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Ba(NO 3 ) 2 ( aq ) + K 2 CrO 4 ( aq ) BaCrO 4 (s) + 2KNO 3 (aq) Formula equation Precipitation Reaction Complete ionic equation Net ionic equation Ba 2+ (aq) + 2NO 3 (aq) + 2K + (aq) + CrO 4 2- (aq) BaCrO 4 (s) + 2K + + 2NO 3 - (aq) Ba 2+ (aq) + CrO 4 2- (aq) BaCrO 4 (s) Spectator ions
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1. Most nitrate (NO 3 ) salts are soluble (NaNO 3 ,KNO 3 ,AgNO 3 …..) 2. Most salts from group 1A metal ions and NH 4 + are soluble. (LiNH
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Lecture 4 part II Chem 102 - Chapter 4 Types of Chemical...

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