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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Simple Rules for Solubility 1. Most nitrate (NO 3 ) salts are soluble. 2. Most alkali metal (group 1A) salts and NH 4 + are soluble. 3. Most Cl , Br , and I salts are soluble (except Ag + , Pb 2+ , Hg 2 2+ ). 4. Most sulfate salts are soluble (except BaSO 4 , PbSO 4 , Hg 2 SO 4 , CaSO 4 ). 5. Most OH are only slightly soluble (NaOH, KOH are soluble, Ba(OH) 2 , Ca(OH) 2 are marginally soluble). 6. Most S 2 , CO 3 2 , CrO 4 2 , PO 4 3 salts are only slightly soluble, except for those containing the cations in Rule 2. Table 4.2 in the textbook pg. 148
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Exercise Example 1. Which of the following ions form compounds with Pb 2+ that are generally soluble in water? a) S 2– b) Cl c) NO 3 d) SO 4 2– e) Na +
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Example 2. Write the correct formula equation, complete ionic equation, and net ionic equation for the reaction between cobalt(II) chloride and sodium hydroxide. •Formula Equation
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This note was uploaded on 09/20/2010 for the course CHEM 102 taught by Professor Peterpastos during the Summer '08 term at CUNY Hunter.

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

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