Chapter 4 - Reactions in Aqueous Solution Chapter 4 A...

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Reactions in Aqueous Solution Chapter 4
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A solution is a homogenous mixture of 2 or more substances The solute is(are) the substance(s) present in the smaller amount(s) The solvent is the substance present in the larger amount Solution Solvent Solute Soft drink ( l ) Air ( g ) Soft Solder ( s ) H 2 O N 2 Pb Sugar, CO 2 O 2 , Ar, CH 4 Sn
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An electrolyte is a substance that, when dissolved in water, results in a solution that can conduct electricity. A nonelectrolyte is a substance that, when dissolved, results in a solution that does not conduct electricity. nonelectrolyte weak electrolyte strong electrolyte
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Strong Electrolyte – 100% dissociation NaCl ( s ) Na + ( aq ) + Cl - ( aq ) H 2 O Weak Electrolyte – not completely dissociated CH 3 COOH CH 3 COO - ( aq ) + H + ( aq ) Conduct electricity in solution? Cations (+) and Anions (-)
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Ionization of acetic acid CH 3 COOH CH 3 COO - ( aq ) + H + ( aq ) A reversible reaction. The reaction can occur in both directions. Acetic acid is a weak electrolyte because its ionization in water is incomplete.
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Hydration is the process in which an ion is surrounded by water molecules arranged in a specific manner. δ + δ - H 2 O
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Nonelectrolyte does not conduct electricity? No cations (+) and anions (-) in solution C 6 H 12 O 6 ( s ) C 6 H 12 O 6 ( aq ) H 2 O
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Precipitation Reactions Precipitate – insoluble solid that separates from solution molecular equation ionic equation net ionic equation Pb 2+ + 2NO 3 - + 2Na + + 2I - PbI 2 ( s ) + 2Na + + 2NO 3 - Na + and NO 3 - are spectator ions PbI 2 Pb(NO 3 ) 2 ( aq ) + 2NaI ( aq ) PbI 2 ( s ) + 2NaNO 3 ( aq ) precipitate Pb 2+ + 2I - PbI 2 ( s )
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Precipitation of Lead Iodide PbI 2 Pb 2+ + 2I - PbI 2 ( s )
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Solubility is the maximum amount of solute that will dissolve in a given quantity of solvent at a specific temperature.
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Solubility of NaCl in water at 20°C = 365 g/L Solubility of AgCl in water at 20°C = 0.009 g/L (Solubility is a complex matter, dealing with enthalpy and entropy, and we’ll cover this more in Chapters 6 and 12) So, Precipitation Reactions are Ion Exchange reactions driven by removal of ions from solution via insoluble ionic compound formation – this is also energy-driven and we’ll discuss this later as well. To predict whether or not a precipitation reaction will occur when two aqueous solutions are mixed: 1. Note all ions present in both of the solutions, and 2. Note all possible combinations of ions, and 3. Are any of the possible combinations insoluble in water?
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Writing Net Ionic Equations 1. Write the balanced molecular equation. 2. Write the ionic equation showing the strong electrolytes completely dissociated into cations and anions. 3. Cancel the spectator ions on both sides of the ionic equation 4. Check that charges and number of atoms are balanced in the net ionic equation AgNO 3 ( aq ) + NaCl ( aq ) AgCl ( s ) + NaNO 3 ( aq ) Ag + + NO 3 - + Na + + Cl - AgCl ( s ) + Na + + NO 3 - Ag + + Cl - AgCl ( s ) Write the net ionic equation for the reaction of silver nitrate with sodium chloride.
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This note was uploaded on 07/15/2011 for the course CHEM 2045 taught by Professor Gower during the Spring '11 term at University of Florida.

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Chapter 4 - Reactions in Aqueous Solution Chapter 4 A...

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