MJ 09 2nd variant - Chemistry Paper3

[Kokeeto]

Hey guys. A question regarding electrolysis seems hard, and the answers in the mark scheme are non-sense..
Here is the link, the second variant: http://www.xtremepapers.me/CIE/index.ph ... 9_qp_3.pdf
Mark Scheme: http://www.xtremepapers.me/CIE/Cambridg ... 9_ms_3.pdf
Number 2, please explain to me "dilute sodium chloride ", why isnt chlorine, oxygen, and sodium hydroxide formed??

 

[amaghraby]

halides(Cl-, I-, Br-, etc )are only released when they are elctrolysed in concentrated aquoes solutions of reactive metals....otherwise, OH- is always released

 

[brainiac]

well if u just see it again it says dilute meaning high water concentration and so more H and OH ions in the soul;tion . on the cathode hydrogen will be given off . on the anode as hydorxide ions are greater in quantity they will be formed and at the end the sodium chloride will not be changed as only hydrogen and oxygen are given off so there wil be no change to the electrolyte ..................... this is a tricky question ........... hope u get it

 

[Kokeeto]

Thanks alot guys, you rock! Good Luck!
My teacher hasnt explained this to us.. :S