請問做實驗時預先幾分鐘把NaOH放入burette有乜問題？
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(expt)預先幾分鐘把NaOH放入burette有乜問題？
2007-03-10 1:47 am
回答 (3)
2007-03-10 3:09 am
✔ 最佳答案
NaOH 佢係Alkaline ka, 所以太早放係burette 到佢會absorb 哂空氣中既CO2(It is an acidic oxide), 咁NaOH 既concentration 咪會降低左, 個experiment 咪唔準lo2NaOH + CO2 → Na2CO3 + H2O
參考: Myself~
2007-03-10 7:34 am
主要係burette係一件好準確的儀器, NaOH attack the intenal wall of burette making inaccuracy
Moreover, as the above said, it react readily with acidic gases in the atmosphere like carbon dioxide
CO2 + 2NaOH -> Na2CO3 + H2O
Moreover, as the above said, it react readily with acidic gases in the atmosphere like carbon dioxide
CO2 + 2NaOH -> Na2CO3 + H2O
2007-03-10 2:40 am
我唔知係咪呢個係咪你想要的答案~
但係我知道以前的burette 係made of glass 的.
glass會俾NaOH 侵蝕,結果令支burette不可再用.
所以如預先幾分鐘把NaOH放入burette,結果支burette就會用唔到.
NaOH唔可以滴出黎.
PS....我later再找找個條equation出黎,我記得係首先NaOH reacts with glass . then the products react the air ,so the burette is destroyed~
但係我知道以前的burette 係made of glass 的.
glass會俾NaOH 侵蝕,結果令支burette不可再用.
所以如預先幾分鐘把NaOH放入burette,結果支burette就會用唔到.
NaOH唔可以滴出黎.
PS....我later再找找個條equation出黎,我記得係首先NaOH reacts with glass . then the products react the air ,so the burette is destroyed~
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