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?
hydrogencarbonate indicator
2013-09-19 3:46 am
回答 (1)
2013-09-19 4:29 am
✔ 最佳答案
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
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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
收錄日期: 2021-04-23 23:30:11
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20130918000051KK00166