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Prob Set 1

# Prob Set 1 - CEM 834 PROBLEM SET 1 FALL 2005 Due at the...

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CEM 834 PROBLEM SET 1 FALL 2005 Due at the beginning of class on Friday, September 16, 2005 Note: For this problem set, you may assume that all salts completely dissociate as given and undergo no secondary equilibria. We will address these assumptions later in this course. Please show your work, being careful of significant figures, units, etc. 1. Calculate the ionic strength (I), individual molarities (C + , C - ), individual activity coefficients ( γ + , γ - ), and individual ionic activities (a + , a - ) for each of the electrochemically important solutions below. Assume that all solutions are aqueous at 25 °C. Use the Debye-Huckel limiting law (DHLL) or the extended Debye-Huckel equation (EDHE), as appropriate, to calculate the activity coefficients. a. 1.00 x 10 -4 M KCl KCl K + + Cl - b. 1.00 x 10 -4 M Fe 2 (SO 4 ) 3 Fe 2 (SO 4 ) 3 2 Fe 3+ + 3 SO 4 2- c. 1.00 x 10 -4 M Ru(NH 3 ) 6 Cl 3 Ru(NH 3 ) 6 Cl 3 Ru(NH 3 ) 6 3+ + 3 Cl - d. 1.00 x 10 -4 M K 4 Fe(CN) 6 K 4 Fe(CN) 6 4 K + + Fe(CN) 6 4- How do your calculated molarities (C + and C - ) compare with the values you determined

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Prob Set 1 - CEM 834 PROBLEM SET 1 FALL 2005 Due at the...

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