Henry 發問於 科學及數學化學 · 1 十年前

如果買左支酒...之後用校內(中學)實驗室工具..搵出酒精%....

如合設計實驗?

1 個解答

評分
  • 1 十年前
    最愛解答

    procedure:

    1.prepare 20cm^3 of each sample

    2.add excess mixture of sodium hydroxide and iodine solution until yellow ppt formed thoroughly

    3.evaporate/ discard the water

    4.weigh the ppt with a electronic balance

    explanation:

    this makes use of iodoform reaction

    ethanol reacts with NaOH/I2 to form CHi3, iodoform

    error:

    random error:

    1.reaction not complete

    2.volumetric inaccurarcy in preparation of the samples

    reminder:

    do not heat the reaction mixture in order to enhance the rate of reaction because alcohol is a volatile liquil with a boiling point of 78 deg only

    資料來源: myself
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