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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 l.jpg
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 l.jpg
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 l.jpg
pH determination

  • pH can be determined from the concentration of H30+ from the following equation:

  • pH=-log[H30+]


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Slide6 l.jpg
Or Zn2+ in solution based on pH can be determined from the following equation:

  • 3.0x1011 * (10-pH)2 = [Zn2+]

  • Or

  • pH = -log ([Zn2+] / 3.0x1011)-1/2


Slide7 l.jpg

  • Some figured values are Zn2+ in solution based on pH can be determined from the following equation:

  • pH 6: .3 M = [Zn2+]

  • pH 7: .003 = [Zn2+]

  • pH 8: 3.0x10-5 = [ Zn2+]


Analyzing solutions l.jpg
Analyzing Solutions Zn2+ in solution based on pH can be determined from the following equation:

  • 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 l.jpg

  • pH= 7.19 Zn2+ in solution based on pH can be determined from the following equation:

  • 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 l.jpg
At Higher Temperatures Zn2+ in solution based on pH can be determined from the following equation:

  • 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 l.jpg

  • pH= 7.19 Zn2+ in solution based on pH can be determined from the following equation:

  • 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.