StudentLecture_12

StudentLecture_12 - CHM 11600 Mon. 2/21/11 Announcements...

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CHM 11600 Mon. 2/21/11 Announcements Exam II two weeks away: Monday March 7, 6:30 pm Covers equilibrium (Ch. 16); organic acids & bases and first the lectures on acids/bases from Ch. 17, and Labs Chapters 7 & 8. Ch. 18 (Buffers/titrations) will not be on the exam. Review session on Friday, March 4 Lab this week: LeChatelier’s Principle, Chapter 6 HW due as usual
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Reminders __________________ contain hydrogen and dissociate in water giving H 3 O + ions __________________ contain OH - ions and dissolve in water liberating OH - ions __________________ donate H + to bases __________________ accept H + from acids
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Neutralization, according to Arrhenius Neutralization is the reaction of an ___________ from the acid and the ___________ from the base to form water, H 2 O. Three representations: HCl (aq) + NaOH (aq) NaCl(aq) + H 2 O(l) H 3 O + (aq) + Cl - (aq) + Na + (aq) + OH - (aq) Na + (aq) + Cl - (aq) + 2H 2 O(l) H 3 O + (aq) + OH - (aq) 2 H 2 O(l)
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Neutralization, more generally A reaction in which the amounts of acid and base are such that ___________ that can be donated ________________ by a base and no base is left over. HCl (g) + NH 3 (g) NH 4 Cl(s) Neutralization in water is a special case H 3 O + (aq) + OH - (aq) 2H 2 O(l) Note: We can use an acid to determine unknown concentration of a base (or vice- versa), by dropwise titration to neutrality
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Brønsted-Lowry Definition An _____ reactant will produce a _____ product and the two will constitute an __________________ pair. A conjugate base is what ___________ after an acid donates an H + A conjugate acid is what _________________ after a base accepts an H + Back to: HA A - + H + ______ donates a proton, it’s an acid _______ accepts a proton, it’s a base
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Base Acid + Acid Base + Reaction 4 H 2 PO 4 - OH - + Reaction 5 H 2 SO 4 N 2 H 5 + + Reaction 6 HPO 4 2- SO 3 2- + Reaction 1 HF H 2 O + F - H 3 O + + Reaction 3 NH 4 + CO 3 2- + Reaction 2 HCOOH CN - + HCOO - HCN + NH 3 HCO 3 - + HPO 4 2- H 2 O + HSO 4 - N 2 H 6 2+ + PO 4 3- HSO 3 - + H 2 O can function as ___________________ The Conjugate Pairs in Some Acid-Base Reactions
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The conjugate base of ____________ is a) H 3 O + b) H 2 O c) OH - d) O 2- e) H - Clicker The conjugate ______ will have one less hydrogen and one more negative or one less positive charge than the _________
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K w = [H 3 O + ][OH - ] In an acidic solution, [H 3 O + ] ____ [OH - ] In a basic solution, [H 3 O + ] ____ [OH - ] In a neutral solution, [H 3 O + ] = __________________________ The extent of dissociation of water K w = [H 3 O + ][OH - ] ______________ H 2 O is mostly undissociated so K w is VERY small! The Ion-Product Constant for water at 25
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StudentLecture_12 - CHM 11600 Mon. 2/21/11 Announcements...

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