1_Electrolytes_in_soln_part_2

1_Electrolytes_in_soln_part_2 - Colligative properties...

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Colligative properties • Compare the colligative properties of a 0.01 m CaCl 2 solution to those of 0.01 m sucrose. – Which would you expect to exert a larger freezing point depression? – Which would have the larger osmotic pressure? i = actual # of particles in soln. at equilibrium ÷ # of particles before dissociation
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In class exercise 13 The osmotic pressure of blood plasma is about 7.5 atm at 37 ° C. Estimate the total concentration of dissolved species and the freezing point of blood plasma. How will your answer change if 50% of the dissolved species dissociate into two ions?
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Thermodynamics of ions in solution 3
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What is an electrochemical reaction? Electrochemical reactions involve electrons, sometimes accompanied by a group of atoms, that are transferred from one species to another (redox reactions). •Combustion •Respiration •Photosynthesis •Corrosion •Batteries and fuel cells Conversion of chemical energy directly to electrical energy
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Standard Reduction Potentials (E o ) Strong oxidizing agent – greatest tendency to pick-up electrons Strong reducing agent – greatest tendency to donate electrons Electrode potential is intensive property (does not depends on the size of the electrode or the amount of solution) REVIEW HOW TO CALCULATE E O FOR A REACTION USING HALF- CELL POTENTIALS!
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The maximum amount of work during during an electrochemical reaction can be calculated w max = - ν FE is the maximum work done and is equal to r G. Q =
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1_Electrolytes_in_soln_part_2 - Colligative properties...

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