Baller97 Posted April 25, 2015 Report Share Posted April 25, 2015 (edited) I'm studying for the May exams that are in a week. Been doing the May 2014 past paper 2 (TZ1) and I've come along this question: Chlorine gas, Cl2(g), is bubbled through separate solutions of aqueous bromine, Br2(aq), and potassium bromide, KBr(aq).Predict any changes that may be observed in each case.(i) Br2(aq):(ii) KBr(aq):Any explanation would be highly appreciated! Edited April 25, 2015 by Baller97 Reply Link to post Share on other sites More sharing options...
IbTrojan Posted April 25, 2015 Report Share Posted April 25, 2015 (i) I don't know what would happen for this one. I want to say nothing would happen though..but I haven't learned diatomic gas reactions. Sorry (ii) For this one, chlorine is more reactive than bromine (higher up on the Periodic table) therefore it would displace the Bromine ion and become Cl2(g) + 2 KBr(aq) --> 2 KCl + Br2(g) 1 Reply Link to post Share on other sites More sharing options...
Baller97 Posted April 25, 2015 Author Report Share Posted April 25, 2015 (i) I don't know what would happen for this one. I want to say nothing would happen though..but I haven't learned diatomic gas reactions. Sorry (ii) For this one, chlorine is more reactive than bromine (higher up on the Periodic table) therefore it would displace the Bromine ion and become Cl2(g) + 2 KBr(aq) --> 2 KCl + Br2(g)Well the markscheme sais:(i) Br2: No change(ii) KBr: Colour change/ from colourless to red/yellow/orange/brown; I just want an explanation for dat ^ Reply Link to post Share on other sites More sharing options...
Emmi Posted April 25, 2015 Report Share Posted April 25, 2015 Chlorine gas won't react with bromine. It wouldn't produce a stable product or anything that would favor a reaction occurring. This is why there is no change. Chlorine gas will, however, react with KBr for the reasons that IbTrojan gave. This produces Br2. KBr is a colorless liquid. Liquid bromine is brownish yellow. Because we're producing bromine, we see the color change. 3 Reply Link to post Share on other sites More sharing options...
IbTrojan Posted April 25, 2015 Report Share Posted April 25, 2015 Yeah, I was going to mention the color change but I wasn't sure if that happened if you added another halogen to a compound with Bromine in it. Didn't realize it worked both ways. Reply Link to post Share on other sites More sharing options...
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