匿名
匿名 發問於 科學及數學化學 · 7 年前

hydrogencarbonate indicator

Cn you help me to answer this queation?

Jonny is given a jar of gas without labels and is asked to indenity the gas . he adds a few drops og hydrogencarbonate indicator to the jar and the colour of the

indicator does not change . He concludes that the gas inside the gas jar is

oxygen.

Which gas can hydrogencarbonate indicator test for?What would the colour change of hydrogencarbonate indicator be if the gas is present?

1 個解答

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  • 7 年前
    最愛解答

    1.hydrogencarbonate indicator is used for carbon dioxide.

    If the carbon dioxide is present ,then the colour of hydrogencarbonate indicator

    changes from red to yellow

    碳酸氫鹽指示劑是用來測試二氧化碳的存在的

    如果二氧化碳是存在的,那麼碳酸氫鹽指示劑的顏色會由紅色轉到黃色

    _______________________________________________________________

    by the way,the conclusion he concludes does not correct,because other gases

    do not change the colour of hydrogencarbonate indicator such as nitrogen and neon.If you truly want to test the present of oxygen,you should put a glowing match to the gas jar .If the match relights ,then the oxygen is present .

    另外,我認為他的結論是錯的,因為有其他的氣體都不會改變碳酸氫鹽指示劑的顏色例如氫氣和氮氣,如果想測試氧氣存在,就要放支有灰燼的火柴落瓶到,火柴再燃燒的話證明瓶有氧氣

    希望可以幫到你

    資料來源: 我自己
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