13_Chapt13_1 - SOLUTIONS Properties of Solutions...

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Mary J. Bojan Chem 110 SOLUTIONS Properties of Solutions (electrolytes) Chapter 4.1 Concentration (Section 4.5, 13.4) molarity M mass % % mole fraction X i ppm molality m Solution process (energy changes) Solubility Saturation supersaturation Factors that Affect Solubility temperature intermolecular interactions pressure 1
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Mary J. Bojan Chem 110 SOLUTIONS Homogeneous mixture : is uniformly mixed on a molecular level. Solute : the component of a mixture that is present in smaller quantity. Solvent : the component of a mixture that is present in greatest quantity. Aqueous solutions : water is the solvent 2
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What is an electrolyte? Mary J. Bojan Chem 110 Which Bulbs Light Up? Distilled H 2 O Tap H 2 O NaCl(aq) 0.1M HCl(aq) 0.1M CH 3 COOH sugar(aq) CH 3 OH DEMO to see which solutions can conduct electricity For bulb to light, some minimum amount of current is needed. amount of current is related to the CONDUCTIVITY of the solution. CONDUCTIVITY : ability to conduct electricity Bulb Wattage 7.5 25 40 3
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Mary J. Bojan Chem 110 Electrolytes: Why do they conduct electricity? Nonelectrolytes – Non-conductors (do not conduct electricity) (glucose) C 6 H 12 O 6 (s)+H 2 O C 6 H 12 O 6 (aq)+ H 2 O Strong electrolytes Good conductors NaCl(s) + H 2 O Na + (aq) + Cl (aq) + H 2 O HCl(aq) + H 2 O H 3 O + (aq) + Cl (aq) Weak electrolytes – Poor conductors NH 3 (aq) + H 2 O NH 4 + (aq) + OH (aq) CH 3 COOH(aq)+H 2 O CH 3 COO (aq)+H 3 O + (aq) 4
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Mary J. Bojan Chem 110 Identifying an electrolyte: Acid, Base or Salt? A. Is the compound ionic or molecular?
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This note was uploaded on 01/18/2012 for the course CHEM 110 taught by Professor Hofmann,brucerob during the Fall '08 term at Pennsylvania State University, University Park.

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13_Chapt13_1 - SOLUTIONS Properties of Solutions...

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