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The diagram below shows a set-up which was used by a student to investigate the effect of electricity on molten lead (ii)bromide before and after...

      

The diagram below shows a set-up which was used by a student to investigate the effect of electricity on molten lead (ii)bromide before and after heating the lead (II)bromide
bromide23112017821.jpg
(a)On heating lead (II) bromide,the bulb lit brightly.Before heating,the bulb did not light.
Explain
(b)Write ionic equations to show the reaction taking place on lead(II) bromide
(i)At the anode
(ii)At the cathode
(c)State and explain one important precaution that this student should have taken while performing this
experiment

  

Answers


Isaac
(a)In solid state,ions in lead (ii) bromide immobile while in fused state,ions become mobile hence
electric current flows
(b)(i) At the anode
$2Br^{-}{(aq)}\rightarrow 2e^{-}+Br_2{(g)}$
(ii)At cathode
$Pb^{2+}+2e^(-)\rightarrow Pb{(s)}$
(c)Experiment done in fume chamber $Br^{2-}$fumes are poisonous
isaacmuthini answered the question on November 23, 2017 at 06:19


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