Fishkeeping - Just Checking

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- - Just Checking (http://www.fishkeepingbanter.com/showthread.php?t=62010)

"bO0oger" .@. wrote in message ...
Have you ever wondered why they don't put all the reagents in one bottle?
The answer should help explain your question.

Explain...

Think about some more and take more than 30 minutes.

What makes you think I was thinking about it 30 minutes ?

Hint: What is the reagent in bottle #1?

Stop playing with "hints" - simply explain, if you can...

And do not forget showing me the proof for your " 95%" statement.

This has already been proved.

??? Where and when ? By who ?
I am talking about AQUARIUM GRADE TEST, not lab reduction column.

"Pszemol" wrote in message
...
"bO0oger" .@. wrote in message
...
Have you ever wondered why they don't put all the reagents in one
bottle? The answer should help explain your question.

Explain...

Think about some more and take more than 30 minutes.

What makes you think I was thinking about it 30 minutes ?

Hint: What is the reagent in bottle #1?

Stop playing with "hints" - simply explain, if you can...

I can explain until I am blue in the face, but the question is will you
understand?

Bottle one contains sulphonilamide, which in the presence of HCl and NO2-
forms a diazonium salt. This reacts immediately with a primary amine also
present in the bottle to form an azo colored dye. The color of the azo dye
is dependant upon the substituents on the phenyl ring of the sulphonilamide.
(The pH indicator methyl orange is another azo dye)

Once the azo dye is formed it is possible that it can begin to decompose
with prolonged standing in the presence of the cadmium and acidic media,
thus effecting its color. Therefore the color change that you see by
extending the 5 minute test to 30 minutes could be a result of this. This
is why the instructions say to wait 5 minutes, not 30 minutes.

"bO0oger" .@. wrote in message ...
Once the azo dye is formed it is possible that it can begin to decompose
with prolonged standing in the presence of the cadmium and acidic media,
thus effecting its color. Therefore the color change that you see by
extending the 5 minute test to 30 minutes could be a result of this.

But the color becomes DARKER over time, not lighter...

Also, you have not responded to my request for "95%" proof.

This thread is getting boring.
We push back and forward same subject and it is clear
that you have no proof behind your 95% statement.
In this case I will have to finish this discussion now,
of course - unconvinced.

"Pszemol" wrote in message
...
"bO0oger" .@. wrote in message
...
Once the azo dye is formed it is possible that it can begin to decompose
with prolonged standing in the presence of the cadmium and acidic media,
thus effecting its color. Therefore the color change that you see by
extending the 5 minute test to 30 minutes could be a result of this.

But the color becomes DARKER over time, not lighter...

It can STILL be a dye when decomposed. This is why I tried to explain to
you that the color of the dye is dependent upon the substituents present on
the sulphonilamide. If a substituents (in this case a sulfonamide group) is
altered (reduced or hydrolyzed), then the color will change.

Also, you have not responded to my request for "95%" proof.

This thread is getting boring.

Tell me about it Pz!

We push back and forward same subject and it is clear
that you have no proof behind your 95% statement.
In this case I will have to finish this discussion now,
of course - unconvinced.

It is difficult to find "proof" for you on a reaction that is so efficient.
I would probably have just as much trouble digging up "proof "for you that
the reaction between a 1M NaOH solution and a 1M HCl solution go to
completion.

You are unconvinced ONLY because you are a bad student Grasshopper! It
isn't always the teacher my son!