CHEM 6C Lecture 7: Ch 22 Solubility Ch 23 Chemical Thermodynamics

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University of California - San Diego
Chemistry and Biochemistry

4/25/17 lecture notes (7) Ch 22 Solubility Ch 23 Chemical Thermodynamics Tuesday, April 25, 2017 9:31 AM Formationof a complex ion will increase solubility of a solid. Hydroxides - Basic hydroxides ○ Dissolve in water to produce basic solution ▪ NaOH. Ba(OH)2 ▪ If not soluble in water they dissolve in acid. - Amphoteric hydroxides ○ Acts as an acidic oxide/hydroxide ○ Acts as a basic oxide/hydroxide - Acidic oxides ○ Dissolve in water to form acidic solutions ○ Dissolve in basic solution if not water Amphoteric hydroxides you should know: - Aluminum - Lead - Zinc - Chromium - Tin Clicker question: What pH will Zinc hydroxide be the least soluble? a) pH = 2 b) 7 c) 12 Answer: 7. Amphoteric means it's soluble in both acid and base so neutral would be least soluble. Calculate the solubility of Al(OH)3 (s) at pH=2, pH=7, and pH=12. Ksp= 1.3*10^-33.Kf= 40 Chemical thermodynamics:the second and third laws Clicker: Which of the following have something in common? I) Ice melts at room temperature II) Iron exposed to moist air rusts III) Perfume diffuses from one side of a room to another IV) Hot pan cools down in a cool room a) They don’t have anything in common b) I and II c) I and IV d) I and III and IV e) They all have som
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