The reaction of bromide and bromate ions in acid solution
Posted 6 January 2006 - 09:37 AM
1. What is the function of phenol?
2. How much of the reaction between bromide and bromate ions is completed after time t? (what is the meaning and how to calculate??)
3. If the activation energy is doubled, would the rate of reaction be expected to increase or decease or remain unaffected?
Posted 6 January 2006 - 12:48 PM
5Br(-) + BrO3(-) + 6H(+) ---> 3Br2 + 3H2O
This reaction is not instantaneously, it takes some time to react all of the reactants. The amount of acid added is in excess. Not all acid will be reacted. After the reaction, 66.7% of the acid remains.
If the activation energy rises, then the reaction can be expected to run at a lower rate, but the total amount of energy produced (or consumed) in the reaction will not be affected.
The role of the phenol is not clear to me. It might be that it is used as an indicator, which tells something about the concentration of the bromine. Phenol forms many highly colored species when it is oxidized, but someone with more knowledge about organical chemistry may give a more complete answer on this.
Posted 7 January 2006 - 03:36 AM
well, what i understand about the role of phenol in this experiment is it react with bromine to form tribromophemol(C6H2Br3OH) and HBr.
when all the phenol has reacted, bromine contimuously produced in the first reaction bleaces the methyl red.
The aim of this experiment is to determine the activation energy of the reaction between bromide and bromate ions in acid solution. I dont understand why phenol is needed.
How much of the reaction between bromide and bromate ions is completed after time t? (what is the meaning and how to calculate??)
Posted 9 January 2006 - 09:47 AM
Since all the volume and concentration of reactants remain the same, the experiment can be done on different temperature to compare the rate of reaction.
Posted 9 January 2006 - 01:10 PM
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