Me Carbonate Equilibria From Pankow David Reckhow CEE 680 #39 2 - - PDF document

CEE 680 Lecture #39 4/6/2020 1

Lecture #39 Precipitation and Dissolution: Metal Carbonates

(Stumm & Morgan, Chapt.7)

Benjamin; Chapter 8.7‐8.15

David Reckhow CEE 680 #39 1

Updated: 6 April 2020

Print version

Me‐Carbonate Equilibria

 From Pankow

David Reckhow CEE 680 #39 2

CEE 680 Lecture #39 4/6/2020 2

David Reckhow CEE 680 #38 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

OH-

Ca+2 H2CO3

*

CO3

• 2

HCO3

• H+

Calcium Carbonate Other Me‐Carbonates I

David Reckhow CEE 680 #39 4

Stumm & Morgan, 1996, Figure 7.9, pg. 377

 Pure water

CEE 680 Lecture #39 4/6/2020 3

Other Me‐carbonates II

 Closed System with

constant CT derived from other species

 3x10‐3 M

David Reckhow CEE 680 #39 5

Stumm & Morgan, 1996, Figure 7.8, pg. 374

Calcium Carbonate

 Closed

System

 Including

hydroxide species

 From

Pankow

David Reckhow CEE 680 #39 6

CEE 680 Lecture #39 4/6/2020 4

Strontium Carbonate

 Closed

System

 Including

hydroxide species

 From

Pankow

David Reckhow CEE 680 #39 7

Manganous Carbonate

 Closed

System

 Including

hydroxide species

 From

Pankow

David Reckhow CEE 680 #39 8

CEE 680 Lecture #39 4/6/2020 5

Ferrous Carbonate

David Reckhow CEE 680 #39 9

 Closed

System

 Including

hydroxide species

 From Pankow

To next lecture

David Reckhow CEE 680 #39 10