CW01-Keq - Notes It is concentration(not the amount in...

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CHM 2046/Myers Worksheet 1 January 06, 2010 1. A Reaction Forming a “Complex Ion.” Fe +3 (aq) + SCN - (aq) Fe(SCN) +2 (aq) Without performing calculations, we want to determine which reactant is limiting. We shall “divide and test” to see which reactant, when added, will produce more product. Experimental Result : 2. Writing Equilibrium Constant Expressions. In general, for Reactants Products, For A + 2 B 3 C + 4 D, 3. The Units of Concentration used in K Expressions: State or Phase Symbol Property Type and Units Used Gases (g) Solutes in solution (aq) Solvent, other liquids (l) Solids (s) 4. Write out K expressions for each reaction. Use the proper term for each R and P. Fe +3 (aq) + SCN - (aq) Fe(SCN) +2 (aq) 2 ICl (g) I 2 (g) + Cl 2 (g) 2 ICl (g) I 2 (s) + Cl 2 (g) CaCO 3 (s) CaO (s) + CO 2 (g) Mg(OH) 2 (s) Mg +2 (aq) + 2 OH - (aq) 2 H 3 O + (aq) + Ag 2 S (s) 2 Ag + (aq) + H 2 S (g) + 2 H 2 O (l)
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Unformatted text preview: Notes:- It is concentration (not the amount in moles) that determines reaction rates and the dynamic equilibrium state.- The numeric value of K depends on the particular reaction , the units of concentration used (Kp or Kc) and the temperature . Usually the units of K are omitted. 5. The following equilibrium data (all at 30. ° C) are available for this reaction: N 2 O 4 (g) 2 NO 2 (g ) Experiment P N 2 O 4 P NO 2 Kp 1 0.723 atm 0.393 atm ______________ 2 0.184 atm 0.197 atm ______________ 3 __________ 0.250 atm ______________ 4 0.500 atm __________ ______________ Write out the K expression for this reaction: Calculate the value for Kp for Experiments 1 and 2. What important point is illustrated by these two results? (c) Find the missing entries for Experiments 3 & 4....
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