Alevelhelp.1
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#1
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#1
the reaction of chlorine with bromine ions. Why is the colour change pale green to orange solution when chlorine is more reactive than bromine ?
Last edited by Alevelhelp.1; 3 months ago
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Kallisto
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#2
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(Original post by Alevelhelp.1)
the reaction of chlorine with bromine ions. Why is the colour change pale green to orange solution when chlorine is more reactive than bromine ?
The chlorine is the stronger oxidising agent. It accepts the donated electrons of the bromine ions. The bromine ions get reduced to bromine and chlorine oxidised to chlorine ions. The change of color shows you this!
Last edited by Kallisto; 3 months ago
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thomas.rhett
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#3
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(Original post by Kallisto)
The chlorine is the stronger oxidising agent. It accepts the donated electrons of the bromine ions. The bromine ions get reduced to bromine and chlorine oxidised to chlorine ions. The change of color shows you this!
I think there are couple of typos here.

Cl2 oxidize Br- to Br2 because its the stronger oxidizing agent. The ON of Br in Br- is (-1) whereas in Br2 it is (0) so the ON has increased which is oxidation. Cl2 (ON 0) is reduced to Cl-.(ON -1). Br-(aq) and Cl-(aq) ions are colorless. Br2(aq) can be yellow/orange depending on concentration.
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Kallisto
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(Original post by thomas.rhett)
I think there are couple of typos here.

Cl2 oxidize Br- to Br2 because its the stronger oxidizing agent. The ON of Br in Br- is (-1) whereas in Br2 it is (0) so the ON has increased which is oxidation. Cl2 (ON 0) is reduced to Cl-.(ON -1). Br-(aq) and Cl-(aq) ions are colorless. Br2(aq) can be yellow/orange depending on concentration.
Guess ON is for oxidation number?

By the way you had a typo too: considering the whole reaction, it is 2Br-, so:

Cl2 + 2Br- -> 2Cl- Br2

know, it is done: one Br- ion has the ON -1, so -2 for two ions. Donating two electrons change the ON 0 in total. Cl2 has ON 0. Accepting the two electrons change the ON to -2.

Did not consider the concentration, good point!
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thomas.rhett
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#5
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(Original post by Kallisto)
Guess ON is for oxidation number?

By the way you had a typo too: considering the whole reaction, it is 2Br-, so:

Cl2 + 2Br- -> 2Cl- Br2

know, it is done: one Br- ion has the ON -1, so -2 for two ions. Donating two electrons change the ON 0 in total. Cl2 has ON 0. Accepting the two electrons change the ON to -2.

Did not consider the concentration, good point!
There is no typo in what I wrote. I wrote Cl2 oxidize Bri- (bromide ion) to Br2.
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