multiple chem equil_allen notes

multiple chem equil_allen notes - Hg 2 2+ + SO 4 2-SO 4 2-+...

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1 Chemical Equilibrium To Solve Multiple Equilibria Problems: 1. Write down the relevant chemical reactions 2. Write the “charge balance” equation a. Magnitude of charge = # in front of the species 3. Write the “mass balance” equation (1 or more) a. If you put it in the solution, it’s still there… 4. Write the equilibrium constant for each reaction 5. Solve for the unknowns a. n unknowns requires that you must have n equations ______________________________________________ An example: Hg 2 SO 4(s) What ionic species will we find? **It’s dissolved in water. [Hg 2 2+ ] [SO 4 2- ] + [OH - ] [H + ] + ??
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2 Chemical Equilibrium 1. Relevant reactions: Hg 2 SO 4(s)
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Unformatted text preview: Hg 2 2+ + SO 4 2-SO 4 2-+ H 2 O HSO 4-+ OH-H 2 O OH-+ H + HSO 4-+ H 2 O H 2 SO 4 + OH-2. Charge balance: [ + ] = [ - ] 2 [Hg 2 2+ ] + [H + ] = 2 [SO 4 2-] + [HSO 4-] + [OH-] 3. Mass balance: [Hg 2 2+ ] = [SO 4 2-] + [HSO 4-] C (Hg 2 2+ ) = analytical concentration = [Hg 2 2+ ] 4. How many Ks will I have? K sp = [Hg 2 2+ ] [SO 4 2-] 7.4 x 10-7 K b = [HSO 4-] [OH-] / [SO 4 2-] K w /K b = K a K w = [OH-] [H + ] 1.0 x 10-14 What happened to the 4 th equilibrium equation? 5. # of unknowns?; # of equations? 5 each Can I solve this problem with 5 unknowns and 5 equations?...
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multiple chem equil_allen notes - Hg 2 2+ + SO 4 2-SO 4 2-+...

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