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![[Post New]](/templates/default/images/icon_minipost_new.gif) 25 Mar 2008 21:08:38 IST
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what happens to the pH of the system when aq KCN is added to acetaldehyde??? a> pH increases b>pH decreases c>it remains the same d>cant be determined as it depends on the concentration of KCN answer fast rates assured!!!!! plz dont just post the answer alone but also the reason and explain my doubts!!!!  |
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25 Mar 2008 21:10:51 IST
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edited
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Nitwit Blubber Odment Tweak
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25 Mar 2008 21:10:52 IST
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i think b
is it rite?
im not sure of the reason
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B.Tech Mechanical
NIT Trichy |
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25 Mar 2008 21:16:20 IST
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computer 001 validate your answer plz!!!
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25 Mar 2008 21:17:58 IST
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fiitjee..
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Nitwit Blubber Odment Tweak
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25 Mar 2008 22:09:40 IST
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answer is a :)
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26 Mar 2008 12:15:24 IST
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hey please just dont post your answer plz explain the answer rohit!!!
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26 Mar 2008 12:18:53 IST
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solution become acidic
therefore decreases
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26 Mar 2008 12:21:23 IST
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nothing happens because acetaldehyde has no replaceable H+ atoms attached to very electronegetive atom
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size doesnt matter, brains do...
vignesh |
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26 Mar 2008 12:22:15 IST
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yeah!!!!! i am not sure!!!! but by the answer given it is so !!! could you plz explain????
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26 Mar 2008 12:23:12 IST
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hey Jungle jalebi is rite!!!! but explain !!!!
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26 Mar 2008 12:38:08 IST
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Since the medium is aqueous, the cyanohydrin formed gets hydrolysed to an acid, hence b)
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Will nip in at times to solve problems :)
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26 Mar 2008 12:46:05 IST
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yeah right.........
but HCN is very weak acid.........
so it wont give out many H+ ions......
but if K reacts wid acetaldehyde... it will form a fully dissociatable salt...
hence the solution should become alkaline...
pH increases....
but i dont think KCN can react wid aldihydes .........
CN- is stronger than aldehydes..
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size doesnt matter, brains do...
vignesh |
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26 Mar 2008 12:49:18 IST
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Ya KCN doesn't react, but HCN does
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Will nip in at times to solve problems :)
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26 Mar 2008 17:57:41 IST
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hey it is an aqeous medium KCN dissociates to form CN- and the H+ is provided from the medium so it does react but my doubt is that if KCN is there it is a salt of strong base weak acid so it would make the medium basic no so even though the cyano hydrin is acidic i accept but still KOH is the strongest base no??? so shouldnt pH increase but i am not sure calrify my doubt no???
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