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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: iyc on February 10, 2006, 11:36:28 PM

Title: Why does the reaction not start?
Post by: iyc on February 10, 2006, 11:36:28 PM
There is two tube A and B, A contains Br- and BrO3- and B cotains sulphuric acid.

Why does the reaction not start until the content of the two tubes are mixed?

Is it due to the electostatic repulsion between negative chareged ion in A causing no reaction in tube A?
If it is true, why does the reaction start if two contents of the tubes are mixed? How will the acid affect the reactant in tube A to make the reaction occur?
Title: Re:Why does the reaction not start?
Post by: Mitch on February 11, 2006, 12:07:14 AM
See number 1 in signature.
Title: Re:Why does the reaction not start?
Post by: iyc on February 11, 2006, 12:18:35 AM
Is it related to that Bromate has oxidizing property when acid is present?
In fact, I don't know why many substances only have oxidizing property when it is in acidic medium?
Title: Re:Why does the reaction not start?
Post by: Morphic flip on February 11, 2006, 08:03:34 AM
That`s the way the contents of test tube A exist.
As previously mentioned - write an equation.
What makes an acid a strong acid? Dissociation of H+ ions.
Title: Re:Why does the reaction not start?
Post by: baikuza on February 15, 2006, 10:15:34 PM
Quote
Why does the reaction not start until the content of the two tubes are mixed?

the same as why not eat before you are hungry.

the last.
Quote
What makes an acid a strong acid? Dissociation of H+ ions.
like Morphic flip. then you have already get it.
Title: Re:Why does the reaction not start?
Post by: AWK on February 16, 2006, 03:13:16 AM
http://jbcs.sbq.org.br/jbcs/2001/vol12_n6/13.pdf
would you like to proceed Belousov-Zhabotinsky Reaction. Then something is missing in your reagents.
Title: Re:Why does the reaction not start?
Post by: Mr T on February 16, 2006, 12:52:46 PM
most Redox rxns occur in either acidic or basic medium (at specific pH value)..
Title: Re:Why does the reaction not start?
Post by: Albert on February 16, 2006, 02:41:11 PM
I think this is the reaction taking place when you mix the content of the test tubes:

BrO3- + 5Br- + 6H+  ->  3Br2 + 3H2O

As you can see, acidic condition are required for the reaction to occur.