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匿名 發問於 科學及數學化學 · 8 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


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

  • 8 年前

    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




    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 .



    資料來源: 我自己