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CHEM 111 (69)

Precipitation reactions, insolubility chart, acid-base reactions, acid/base strength, H+

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CHEM 111
Dana Johnson

12 November Announcements Exam sections Bond & molecular polarity, intermolecular forces, gas laws, solutions, chemical equations, precipitation reactions 9.5, 10.3, 12.1, 12.3, 5.1, 5.3, 5.4, 5.6, 4.1, 4.2, 4.3, 3.3 Problem session in class Monday, 11 / 15 (no clicker points → optional day) Review session Monday, 11 / 15 @ 6 pm in A101 Refined model assignment Form on RamCT Due by Wednesday, 11 / 17 Clicker question When you mix K PO 3aq) 4nd Ca(NO ) (aq) to3 2rm Ca (PO ) (s) 3nd KN4 2aq), what 3 is the stoichiometric ratio of Ca 3PO )4 2) to KNO (aq3 in the molecular equation? A. 1:2 B. 1:6 C. 2:3 D. 2:1 E. 3:1 2K 3O (4q) + 3Ca(NO ) (aq3 2 Ca (PO ) (s3 + 64 2 (aq) 3 Precipitation reactions Two soluble ionic reactants forming a precipitate The precipitate is the insoluble solid that falls out of solution Precipitation rxns cont’d General formula : AB (aq) + CD (aq) → AD (s) + CB (aq) Ions switch places with each other “Double-displacement” reaction If one of the combinations is insoluble, you have a precipitation reaction Insolubility chart Once you know the possible products, refer below to determine if any of them are insoluble
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