CEE 680 Lecture #41 4/8/2020 0 H + -1 Al Total -2 -3 - Al(OH) - - PDF document

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CEE 680 Lecture #41 4/8/2020 0 H + -1 Al Total -2 -3 - Al(OH) - - PDF document

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CEE 680 Lecture #41 4/8/2020 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

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SLIDE 1

CEE 680 Lecture #41 4/8/2020 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

 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 2

CEE 680 Lecture #41 4/8/2020 2

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

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 3

CEE 680 Lecture #41 4/8/2020 3

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

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 4

CEE 680 Lecture #41 4/8/2020 4

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

 Fig 8.7 in

Benjamin

David Reckhow CEE 680 #41 8

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SLIDE 5

CEE 680 Lecture #41 4/8/2020 5

To next lecture

David Reckhow CEE 680 #41 9

Practice

 Prepare solubility diagrams separately for:

 Zn(OH)2  ZnCO3

 Combine  Others?

 Mn, Pb, Cd

David Reckhow CEE 680 #40 10