Solubility Equilibrium. Solutions. Dissociation Equations. April/May Chemistry 30
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1 Solubility Equilibrium Chemistry 30 Solutions Mixture containing two or more components, but looks like one homogeneous substance Solute: dissolved substance Solvent: dissolving substance In this course: ionic compounds dissolved in water only Dissociation Equations Ionic compounds dissolve in water by dissociation (breaking apart) For example: Ba(NO 3 ) 2 (s) Ba 2+ (aq) + 2 NO 3- (aq) 1
2 Example: Dissociation Equations Na 2 SO 4 Ca(C 2 H 3 O 2 ) 2 Describing Solutions The amount of solute in a solvent can be described qualitatively by the terms dilute and concentrated. These are qualitative terms: A concentrated solution has lots of solute per volume of solvent A dilute solution has very little solute per volume of solvent Describing Solutions Every substance has a maximum amount of solute that can dissolve in the solvent. This allows for a quantitative description: Unsaturated solutions have less than the maximum amount of solute Saturated solutions are at the maximum amount Supersaturated solutions have more than the maximum amount of solute, usually achieved by raising the temperature to dissolve the solute and then slowly cooling 2
3 Describing Solutions Dilute Unsaturated Concentrated Saturated Supersaturated Solubility Solubility: how much of something can dissolve in something else When the maximum amount is dissolved, the solution is saturated Very soluble will dissolve a lot, low solubility will dissolve very little Analogy: marbles in a bucket Marbles = ions, bucket size = level of solubility Solubility Chart 3
4 Solubility Solubility is a scale Soluble compounds dissociate 100% in solution Dissociation equation has a one-way arrow NaCl (s) Na + (aq) + Cl - (aq) Low solubility means it dissociates less than 100% (some ions will stay attached) Dissociation equation has an equilibrium arrow PbI 2 (s) Pb 2+ (aq) + 2I - (aq) Determining Solubility Option 1: Solubility Rules Chart Qualitative Sorted by anion Note: soluble = aqueous, low solubility = solid Examples: Solubility Rules Soluble (aq) or low solubility (s)? Ba(OH) 2 Na 3 PO 4 CuI 2 Pb(NO 3 ) 2 AgC 2 H 3 O 2 CaCO 3 4
5 Double Displacement Reactions General form: AB + CD AD + CB If AD and/or CB has low solubility, it will make a solid. Otherwise no reaction occurs everything stays dissolved as ions. Double Displacement Reactions Example: Solubility Rules Na 2 CO 3 (aq) + 2 AgNO 3 (aq) 2 NaNO 3 + Ag 2 CO 3 2 KI (aq) + MgCO 3 (aq) K 2 CO 3 + MgI 2 Al 2 (CrO 4 ) 3 (aq) + H 2 SO 4 (aq) Cu 2 SO 4 (aq) + CaCl 2 (aq) 5
6 Total Ionic Equations In the following reaction, copper(ii) hydroxide has low solubility in water and will form a precipitate: 2 NaOH (aq) + CuCl 2 (aq) 2 NaCl (aq) + Cu(OH) 2 (s) This can be rewritten as a total ionic equation, where all aqueous compounds are more correctly represented as ions: 2 Na + (aq) + 2 OH - (aq) + Cu 2+ (aq) + 2 Cl - (aq) 2 Na + (aq) + 2 Cl - (aq) + Cu(OH) 2 (s) Net Ionic Equations Spectator ions: ions that do not participate in the reaction Net ionic equation: remove spectator ions from total ionic equation (no net ionic if no precipitate) 2 OH - (aq) + Cu 2+ (aq) Cu(OH) 2 (s) Net Ionic Equations Why do double displacement reactions have equilibrium arrows instead of regular arrows? How is a net ionic equation related to a dissociation equation? When should you use a dissociation equation vs a net ionic equation? 6
7 Example: Net Ionic Equations Write the reaction, total ionic and net ionic equations for the reaction between barium nitrate and sodium carbonate that produces a barium carbonate precipitate. (Use the right arrow!) Determining Solubility Option 2: Solubility Product Constant (K sp ) Constant for a compound, in water, at 25 C. Describes how much a compound will dissolve Compounds with no K sp listed are very soluble If listed, compound has low solubility. Large K sp = more soluble, small K sp = less soluble Which is more soluble? PbBr 2 or PbCl 2 Example: K sp BaSO 4 or Ag 2 SO 4 Co(OH) 2 or CuCO 3 7
8 Solubility Product To determine solubility or concentration of one or more ions, given the dissociation equation: A a B b (s) a A + (aq) + b B - (aq) Use an equilibrium constant expression! K sp = A + a B b (Remember solids have a concentration of 1 and are not included in the expression.) Determining Solubility AB (s) A + (aq) + B - (aq) Use K sp to determine how many moles of AB per litre of solution will dissolve. Use x like in the C row on an ICE chart to compare moles for each ion. Example 1: Determining Solubility Determine the solubility of AgBr in mol/l at 25 C. 8
9 Example 2: Determining Solubility Determine the concentration of fluoride ions in a saturated solution of magnesium fluoride. Ion Product Constant Similar to Q c Determines if a precipitate will form Basically: are there enough of each of the ions to saturate the solution? Same calculation as K sp, but use concentrations of ions being mixed together Q sp K sp, precipitate will form Q sp < K sp, no precipitate Example 1: Ion Product You are mixing two solutions of equal volume: M NaCl and M Pb(NO 3 ) 2. Will a precipitate form? 1. Determine solid produced and net ionic equation. 2. Determine new concentrations of ions. 9
10 Example 1: Ion Product (continued) 3. Calculate Q sp. 4. Compare K sp and Q sp. Example 2: Ion Product Will a precipitate form if ml of M Ba(NO 3 ) 2 solution is mixed with ml of M K 2 SO 4 solution? 10
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