Review for Exam 3

Review for Exam 3 - 9. indicators color (In) HIn H+ +...

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9. indicators – color (In) HIn  H+ + In- (pKa) , (pKin) Color 1 Color 2 Yellow Red HIn = unionized, protonated, cation In- = ionized, deprotonated, anion pKin = 5 6 or higher : red 4 or lower: yellow 4.7-5.3 = orange Color change, pKa+/- 1 10. pick the best indicator for titration Indicator changes color at its pKa. (+ / - 1) Goal of most titrations is to stop at the equivalence point. Want indicator to change color at equivalence point ****Equivalence point pH = indicator pKa*** Problem is REALLY asking to estimate the pH at equivalence point. Find the pH at equivalence point, pick closest pKIn 11. Solubility Ksp – equilibrium constant. MZ (s)  M+ + Z- Mostly MZ, little bit of M+ and Z-. Which means K sp = very small Ksp = [M][Z]a MY3  M3+ + 3Y-
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Ksp = [M][Y]^3 12. Molar solubility How much goes into solution. MZ  M+ + Z- Initial: Bunch of MZ, 0 M, 0 Z +x +x Ksp = [M][Z] = (x)(x) Molar solubility = mol/L, can be given grams/Liter, or ppm (mg/L) 13. Rank solubilities
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This note was uploaded on 11/18/2010 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas.

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Review for Exam 3 - 9. indicators color (In) HIn H+ +...

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