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Solubility Lesson 7 Changing solubility

Solubility Lesson 7 Changing solubility. When to and When not to Multiply the Molarity 1. The molar solubility of Ba(OH) 2 is 2. Equal volumes of 0.0010 M Ba(NO 3 ) 2 and 0.0010 M . Ksp = ? 0.0010 M NaOH are mixed . Will a precipitate occur?. Multiply by 2 because of Ba(OH) 2(s).

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Solubility Lesson 7 Changing solubility

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  1. Solubility Lesson 7 Changing solubility

  2. When to and When not to Multiply the Molarity 1. The molar solubility of Ba(OH)2is 2. Equal volumes of 0.0010 M Ba(NO3)2and 0.0010 M. Ksp = ?0.0010 M NaOH are mixed. Will aprecipitateoccur? Multiply by 2 becauseofBa(OH)2(s) Do not multiply by 2 because of NaOH Ba(OH)2(s)⇌ Ba2+ + 2OH- Ba(OH)2(s)⇌ Ba2+ + 2OH- s s 2s 0.0010 M 0.0010 M 1 1 0.00050 M 0.00050 M 2 2 TIP = [Ba2+][OH-]2 Ksp= [Ba2+][OH-]2 Ksp= [s][2s]2 TIP = [0.00050][0.00050]2 Ksp=4s3 TIP = 1.25 x 10-10 Ksp = 4[0.0010]3 Ksp = 4.0 x 10-9 TIP < Ksp No ppt.

  3. 3. AgNO3(s) is added to 1.0 L of a solution containing Cl- in order to precipitate out the Cl- as AgCl(s). After the AgCl(s) is filtered out what is the remaining concentration of Cl-? AgCl(s)⇌ Ag+ + Cl- s s s Ksp = s2 1.8 x 10-10 = s2 s = [Cl-] = 1.3 x 10-5 M

  4. The molar solubilityis the amount of PbCl2(s) in moles per litrethat dissolves into ions to form a saturated solution. increases the molar solubility energy + PbCl2(s)⇌ Pb2+ + 2Cl- decreases the molar solubility Solid equilibriums are endothermic. Only changing the temperature changes the Ksp.

  5. Changing the Solubility of a Salt energy + AgCl(s)⇄ Ag+ + Cl- Substance Added Molar Solubility Ksp Effect AgNO3 Decrease none NaCl Decrease none Increase none Na2S 2Ag+ + S2- → Ag2S(s) Pb(NO3)2 Increase none Pb2+ + 2Cl- → PbCl2(s)

  6. Changing the Solubility of a Salt energy + AgCl(s)⇄ Ag+ + Cl- Substance Added Molar Solubility Ksp Effect moles/L does not change H2O none none none AgCl none solid Increase Temperature Increase Increase Decrease Decrease Decrease Temperature

  7. Changing the Solubility of a Salt Ca(OH)2(s)⇄ Ca2+ + 2OH- Substance Added Effect on Molar Solubility Effect on Ksp none Decrease Ca(NO3)2 Na2SO4 Increase none NaOH Decrease none none HCl Increase none NaCl none none none Ca(OH)2 Increase Temperature Increase Increase Decrease Temperature Decrease Decrease

  8. 1. Mg(OH)2 will have the greatest solubility in: Mg(OH)2(s) ⇌ Mg2+ + 2OH- A. NaOH B. Mg(NO3)2 C. H2O OH- lowers solubility Mg2+ lowers solubility No effect solubility D. AgNO3 Ag+ increases solubility by reacting with OH-

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