Preparation of haloalkane
in the preparation of haloalkane :2-methylpropan-2-ol+HCI(arrow)2-chloro-2-methylpropane+H20,some acid impurities willleft on the surface of the apparatus.Why is sodium hygrohencarbonate used to remove acid impurities,rather than a stronger alkali such as sodium hydroxide? think of the chemical properties of haloalkane, then you can blow water tips: elimination and substitution
think about the reactants of these 2 reactions 原帖由 Zend 於 20-9-2008 15:17 發表 http://www.nakuz.com/bbs/images/common/back.gif
think of the chemical properties of haloalkane, then you can blow water
答之前唔該諗清楚=.=
冇幾耐我做完個實驗我唔係咁答,但係岩左
Miss話你諗個方向係好多人常犯既錯
原帖由 .•Ｈuｎg▊鴻 於 20-9-2008 16:38 發表 http://www.nakuz.com/bbs/images/common/back.gif
tips: elimination and substitution
think about the reactants of these 2 reactions
都係上面個句
tip:諗下add NaOH同add NaHCO3 出既pdt有咩分別 原帖由 j32738 於 20-9-2008 05:58 PM 發表 http://www1.nakuz.com/bbs/images/common/back.gif
答之前唔該諗清楚=.=
冇幾耐我做完個實驗我唔係咁答,但係岩左
Miss話你諗個方向係好多人常犯既錯
都係上面個句
tip:諗下add NaOH同add NaHCO3 出既pdt有咩分別
我覺得我想得arm bor
我記得係kinetic 都有做過similar reaction
HCO3- 同acid react?
回復 4# 的帖子
我可能chem根基唔好不如你講下答案
回復 5# 的帖子
我都係講我寫果個答案加NaHCO3去remove HCl 有CO2出
加NaOH 係冇observable change
所以determine唔到幾時remove晒HCl
NaOH係唔會同haloalkane react,除非加熱
明未? NaOH 唔會同haloalkane 反應? 加熱先得?
你肯定?
回復 7# 的帖子
你呢個reason係岩但唔係main pt.
無需要知道幾時先remove晒
2者都係in excess
最後都係用solvant extraction姐
NaOH係唔會同haloalkane react,除非加熱
呢句我非常有保留 如果有reaction => 就應該prevent 有excess ge sodium hydroxide/sodium bicarbonate
如果無reaction, 我大可以加到過量都無事... 又或者用#7 果招, solvent extraction, 整走bottom layer 果層haloalkane , then KO ...
我估reaction , 同#7 果個上part 都係原因, 而且係有關=.=
#7, arm arm check 番New Way, 係RTP 都有reaction for tertiary haloalkane....
大部分都係elimination reaction ~~
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