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In class notes for December 5, 2007

In class notes for December 5, 2007 - NaCl(s ⇌ Na(aq...

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General Chemistry Lecture 102a In class notes for December 5, 2007 Ch 8 OWL due Friday at 11:59 pm Ch 9 OWL due a week from Thursday at 11:59 pm Try suggested Oxtoby problems on polyprotic acids (see OAK) Check OAK for information about a review during finals week = [ ][ ] KaIN H3O In HIn [In] is color 2 and [Hin] is color 1 Clicker Quiz o An aqueous acetic acid solution and an aqueous perchoric acid solutions are found to have the same pH at 25 C. If equal volumes of each are used to neutralize a KOH solution, which of the statements will be true? The acetic acid will neutralize a larger volume of the KOH solution. SEE A o Consider a buffer composed of aquesous NH4Cl and NH3. At 25 C, Ka for NH4+ = 5.6x10 -10 . The NH4+/NH3 buffer system could be used to prepare an effective buffer at a pH equal to: 9.25 Chapter 9- Solubility Equilibrium o Saturated solution Concentratioins correspond to max solubility and soluid present NaCl → . 36g100mL 62mol100mL 6 2 M There must be an equilibrium between the solid and the aqueous ions
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Unformatted text preview: NaCl(s) ⇌ Na + (aq) + Cl-(aq) o Unsaturated solution Concentration below max solubility o Supersaturated solution Concentration is greater than max solubility. No solid present. o We will always write these starting with solid as the reactant. Ex. • Mg(OH) 2 (s) ⇌ Mg 2+ (aq) + 2OH-(aq) K sp (solubility product) • K sp =[Mg 2+ ][OH-] 2 General Chemistry Lecture 102a In class notes for December 5, 2007 • Think about the solubility • Mg(OH) 2 (s) ⇌ Mg 2+ (aq) + 2OH-(aq) • Our solubility is defined based on the number of the reactant that is dissolved • Used a ICE table • So at equilibrium we get K sp =[s][2s] 2 = 4s 3 • Ksp is not equal to the solubility • Mg(OH) 2 is not in the equilibrium constant because it is a solid • Ksp solubility and vice versa o ONLY WORKS FOR INSOLUBLE SALTS o Because of ion pairing and non ideal behavior of solution • •...
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