Print version Updated: 8 April 2020 Lecture #41 Precipitation and - - PowerPoint PPT Presentation

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Print version Updated: 8 April 2020 Lecture #41 Precipitation and - - PowerPoint PPT Presentation

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Print version Updated: 8 April 2020 Lecture #41 Precipitation and Dissolution: Solubility of Mixed Solids (Stumm & Morgan, Chapt.7) Benjamin; Chapter 8.7-8.15 David Reckhow CEE 680 #41 1 0 ZnOH + Zn +2 -1 Zn Total H + Zn(OH) 2 -2

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SLIDE 1

Lecture #41 Precipitation and Dissolution: Solubility of Mixed Solids

(Stumm & Morgan, Chapt.7)

Benjamin; Chapter 8.7-8.15

David Reckhow CEE 680 #41 1

Updated: 8 April 2020

Print version

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SLIDE 2

 Zn solubility  Compare to Stumm &

Morgan’s fig. 6.8c, pg.273

David Reckhow CEE 680 #40 2

pH

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Log C

  • 14
  • 13
  • 12
  • 11
  • 10
  • 9
  • 8
  • 7
  • 6
  • 5
  • 4
  • 3
  • 2
  • 1

H+

OH-

Zn+2 Zn(OH)4

  • 2

ZnOH+ Zn(OH)2 (aq) Zn2(OH)6

  • 2

ZnTotal Zn(OH)3

  • Zn2(OH)+3

Zn(OH)2

From Lecture #36

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SLIDE 3

David Reckhow CEE 680 #41 3

pH

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Log C

  • 14
  • 13
  • 12
  • 11
  • 10
  • 9
  • 8
  • 7
  • 6
  • 5
  • 4
  • 3
  • 2
  • 1

H+

OH-

Al+3 Al(OH)4

  • AlOH+2

Al(OH)2

+

Al(OH)3 AlTotal AlOH+2 Al(OH)2

+

Al+3 Al(OH)3 Al(OH)4

  • AlTotal

 Gibbsite  0.0001 M

total phosphate

 Aluminum

hydroxide in black

 Aluminum

phosphate in red Similar to HW prob. 9.1, except that is for amorphous Al(OH)3

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SLIDE 4

David Reckhow CEE 680 #41 4

pH

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Log C

  • 14
  • 13
  • 12
  • 11
  • 10
  • 9
  • 8
  • 7
  • 6
  • 5
  • 4
  • 3
  • 2
  • 1

H+

OH-

Al+3 Al(OH)4

  • AlOH+2

Al(OH)2

+

Al(OH)3 AlTotal AlOH+2 Al(OH)2

+

Al+3 Al(OH)3 Al(OH)4

  • AlTotal

AlPO4 Al(OH)3 (gibbsite)

 Gibbsite  0.0001 M

total phosphate

 Aluminum

hydroxide in black

 Aluminum

phosphate in red

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SLIDE 5

David Reckhow CEE 680 #41 5

pH

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Log C

  • 14
  • 13
  • 12
  • 11
  • 10
  • 9
  • 8
  • 7
  • 6
  • 5
  • 4
  • 3
  • 2
  • 1

H+

OH-

Al+3 Al(OH)4

  • AlOH+2

Al(OH)2

+

Al(OH)3 AlTotal AlOH+2 Al(OH)2

+

Al+3 Al(OH)3 Al(OH)4

  • AlTotal

 Amorphous

Al(OH)3

 0.0001 M

total phosphate

 Aluminum

hydroxide in black

 Aluminum

phosphate in red

slide-6
SLIDE 6

David Reckhow CEE 680 #41 6

pH

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Log C

  • 14
  • 13
  • 12
  • 11
  • 10
  • 9
  • 8
  • 7
  • 6
  • 5
  • 4
  • 3
  • 2
  • 1

H+

OH-

Al+3 Al(OH)4

  • AlOH+2

Al(OH)2

+

Al(OH)3 AlTotal AlOH+2 Al(OH)2

+

Al+3 Al(OH)3 Al(OH)4

  • AlTotal AlPO4

Al(OH)3 (am)

 Amorphous

Al(OH)3

 0.0001 M

total phosphate

 Aluminum

hydroxide in black

 Aluminum

phosphate in red

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SLIDE 7

David Reckhow CEE 680 #41 7

pH

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Log C

  • 14
  • 13
  • 12
  • 11
  • 10
  • 9
  • 8
  • 7
  • 6
  • 5
  • 4
  • 3
  • 2
  • 1

CT = 10-3

H+

OH-

Fe(OH)+ Fe+2 FeTotal Fe(OH)3

  • FeCO3

Fe(OH)2

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SLIDE 8

 Fig 8.7 in

Benjamin

David Reckhow CEE 680 #41 8

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SLIDE 9

To next lecture

David Reckhow CEE 680 #41 9

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SLIDE 10

Practice

 Prepare solubility diagrams separately for:

 Zn(OH)2  ZnCO3

 Combine  Others?

 Mn, Pb, Cd

David Reckhow CEE 680 #40 10