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Topic: Why does the reaction not start?  (Read 4893 times)

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Offline iyc

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Why does the reaction not start?
« 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?
« Last Edit: February 10, 2006, 11:42:40 PM by iyc »

Offline Mitch

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Re:Why does the reaction not start?
« Reply #1 on: February 11, 2006, 12:07:14 AM »
See number 1 in signature.
Most Common Suggestions I Make on the Forums.
1. Start by writing a balanced chemical equation.
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Offline iyc

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Re:Why does the reaction not start?
« Reply #2 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?

Offline Morphic flip

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Re:Why does the reaction not start?
« Reply #3 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.
« Last Edit: February 11, 2006, 08:07:22 AM by Morphic flip »

baikuza

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Re:Why does the reaction not start?
« Reply #4 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.

Offline AWK

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Re:Why does the reaction not start?
« Reply #5 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.
« Last Edit: February 16, 2006, 04:16:17 AM by AWK »
AWK

Mr T

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Re:Why does the reaction not start?
« Reply #6 on: February 16, 2006, 12:52:46 PM »
most Redox rxns occur in either acidic or basic medium (at specific pH value)..

Offline Albert

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Re:Why does the reaction not start?
« Reply #7 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.

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