Experiment to show that benzoic acid contains carbon and hydrogen.

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[Nicola Yong Siaw Hui]

Dear chemistry teachers,

This is an essay question from Form 5 Chemsitry text book on page 102. Anyone know what is the answer? In my mind is combustion and will produce carbon dioxide and water. Is this correct?
Pls advice. Thank you.

[Jong Kah Yin]

Combustion of benzoic acid should be  good enough to show the presence of carbon and hydrogen in benzoic acid but in the procedure, include the tests for carbon dioxide and water produced

[Wilter Hawell]

 

[Nicola Yong Siaw Hui]

Thank you Mr Jong! Do we heat the benzoic acid directly in a combustion tube or in water bath?
For the products, is it if we can shown the present of carbon dioxide and water will proof that benzoic acid contain carbon and hydrogen?
Thanks again.

[Jong Kah Yin]

I prefer to heat directly as the maximum temperature of water bath is only 100oC, may not be high enough to trigger the combustion

[Nicola Yong Siaw Hui]

Thanks again Mr Jong. I just realised that combustion of benzoic acid must be burnt directly, right? Just like the experiment of combustion of alcohol. But I'm not sure how to set up the apparatus to burn the benzoic acid so that we can collect the products to test the presence of CO2 and H2O. Please advice. Thanks.

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