Ping BOOMER

I just wanted to respond to your equation question. I am not sure if you
are still reading the alkalinity posts.

Boomer, sorry for the name calling in the previous post.


Let me respond to your equation question that you thought I was avoiding.

B (Buffering Index) = dCb / dpH = 2.303 ( Kw/[H30+] + [H30+] + CKa [H3O+]/
(Ka + H3O+])² )


C = total concentration of the acid + conjugate base = [HA] + [A-]
Unknown
Ka = acid dissociation constant. Found in a table
[H3O] = Determined from pH. where pH = -log [H+]
Kw = ion product of water. Constant.

Only unknown in the equation is C which is [HA] + [A-].

In this case the conjugate base is CO3- and the acid is HCO3-2 and Ka is
Ka2 for carbonic acid.

One way to solve the equation is to determine the combined concentrations of
[CO3-] and [HCO3-2] in solution.

Do you recognize [HCO3-1] and [CO3-2] from another equation ? Yes, your
alkalinity equation.

So when we measure ALKALINITY we are indirectly measuring BUFFERING
CAPACITY.

Because aquarium and sea water have other buffers in solution, you need to
determine the BUFFERING INDEX for each buffer in solution.

Does this help? Or are we NEVER going to agree on anything?

See post below

--
Boomer

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If You See Me Running You Better Catch-Up
"stoutman" .@. wrote in message news:jfdWb.267867$I06.2858290@attbi_s01...
: I just wanted to respond to your equation question. I am not sure if you
: are still reading the alkalinity posts.
:
: Boomer, sorry for the name calling in the previous post.
:
:
: Let me respond to your equation question that you thought I was avoiding.
:
: B (Buffering Index) = dCb / dpH = 2.303 ( Kw/[H30+] + [H30+] + CKa [H3O+]/
: (Ka + H3O+])² )
:
:
: C = total concentration of the acid + conjugate base = [HA] + [A-]
: Unknown
: Ka = acid dissociation constant. Found in a table
: [H3O] = Determined from pH. where pH = -log [H+]
: Kw = ion product of water. Constant.
:
: Only unknown in the equation is C which is [HA] + [A-].
:
: In this case the conjugate base is CO3- and the acid is HCO3-2 and Ka is
: Ka2 for carbonic acid.
:
: One way to solve the equation is to determine the combined concentrations of
: [CO3-] and [HCO3-2] in solution.
:
: Do you recognize [HCO3-1] and [CO3-2] from another equation ? Yes, your
: alkalinity equation.
:
: So when we measure ALKALINITY we are indirectly measuring BUFFERING
: CAPACITY.
:
: Because aquarium and sea water have other buffers in solution, you need to
: determine the BUFFERING INDEX for each buffer in solution.
:
: Does this help? Or are we NEVER going to agree on anything?
:
:
:
: