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Zn Solubility. Zn2+ in ACSF . How much ZnCl2 can be added to a solution of ACSF at a given temperature before one will observe a precipitate. What effect does pH have on solutions. Formulas. Zinc Hydroxide in water. Zn(OH)2 (s)  Zn2+(aq) + 2OH- (aq) Ksp= 3.0x10-17

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zn2 in acsf
Zn2+ in ACSF
  • How much ZnCl2 can be added to a solution of ACSF at a given temperature before one will observe a precipitate.
  • What effect does pH have on solutions.
formulas
Formulas
  • Zinc Hydroxide in water.
    • Zn(OH)2 (s)  Zn2+(aq) + 2OH- (aq) Ksp= 3.0x10-17
    • 2OH-(aq)+ 2 H30+(aq) 4H20(l) (K1/w= 1.0x1014)2
    • Zn(OH)2(s) + H30+ (aq) Zn2+ (aq) + 4H20(l)

Knet= 3.0x10-17 * 1.0x1014 * 1.0x1014 = 3.0x1011

ph determination
pH determination
  • pH can be determined from the concentration of H30+ from the following equation:
  • pH=-log[H30+]
slide5
From the reaction and the previous equation, the amount of Zn2+ in solution based on pH can be determined from the following equation:
  • 3.0x1011 = [Zn2+]

_______

[H30+]2

slide6
Or
  • 3.0x1011 * (10-pH)2 = [Zn2+]
  • Or
  • pH = -log ([Zn2+] / 3.0x1011)-1/2
slide7
Some figured values are
  • pH 6: .3 M = [Zn2+]
  • pH 7: .003 = [Zn2+]
  • pH 8: 3.0x10-5 = [ Zn2+]
analyzing solutions
Analyzing Solutions
  • pH= 7.29
  • 24° C
    • 100 µM
      • 0/4 solutions had visible precipitations.
    • 200 µM
      • 0/4 solutions had visible precipitations.
    • 300 µM
      • 0/4 solutions had visible precipitations.
    • 400 µM
      • 0/4 solutions had visible precipitations.
    • 500 µM
      • 0/4 solutions had visible precipitations.
    • 600 µM
      • 0/4 solutions had visible precipitations.
  • Upon sitting, solutions that contained 400 µM to 600 µM ZnCl2 showed precipitation at the bottom of centrifuge tube.
  • pH of solution did not decrease significantly. Lowest pH was measured at 7.23
slide9
pH= 7.19
  • 21.6° C
    • 300 µM
      • 0/3 solutions had visible precipitations.
    • 400 µM
      • 0/3 solutions had visible precipitations.
    • 500 µM
      • 0/3 solutions had visible precipitations.
    • 600 µM
      • 0/3 solutions had visible precipitations.
      • Lowest pH was measured at 7.17
at higher temperatures
At Higher Temperatures
  • pH= 7.29
  • 34° C
    • 100 µM
      • 0/2 solutions had no visible ppt.
    • 200 µM
      • 0/2 solutions had no visible ppt.
    • 300 µM
      • 2/2 solutions had visible ppt.
    • 400 µM
      • 2/2 solutions had visible ppt.
    • 500 µM
      • 2/2 solutions had visible ppt.
    • 600 µM
      • 2/2 solutions had visible ppt.
  • All of these solutions had been left overnight in a water bath at 35° C.
slide11
pH= 7.19
  • 35.3° C
    • 300 µM
      • 0/3 solutions had visible ppt.
    • 400 µM
      • 0/3 solutions had visible ppt.
    • 500 µM
      • 0/3 solutions had visible ppt.
    • 600 µM
      • 0/3 solutions had visible ppt.
  • Solutions had been left standing for approximately 1 hour.
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