My friend has given me 70% ethanol in a 50 mL falcon tube (50 mL) , I want to test/know whether it's concentration is 70% or not, How to know that (Because sometimes there may be mistake in ethanol and water mixing volume calculations during preparation/ wrong labelling e.t.c)
there s an article in portuguese with abstract in english:
https://periodicos.unisanta.br/index.php/ENPG/article/download/1593/1308
this method uses raman
another uses infra red spectrofotometry:
https://proceedings.science/simbravisa-2019/papers/validacao-laboratorial-de-metodo-analitico-por-espectrofotometria-vis-para-determinacao-do-teor-de-alcool-etilico-na-for?lang=en
thesesare in english:
https://www.scielo.br/j/jbchs/a/yDnwM9wFJFSXtkqVxCdTcPx/?lang=en
Article Alcoholmeter as a Simple and Accessible Way for Ethanol Dete...
The most accessible method is probably to measure the specific gravity of the solution. A chart of specific gravity versus ethanol % can be found here, or probably in an old copy of the Handbook of Chemistry and Physics.
Conference Paper An experimental study on effect of operating parameters on f...
Another accessible method, if you have access to a refractometer, is to measure the refractive index.
Here is an RG discussion that may be helpful:
https://www.researchgate.net/post/Any_quick_method_to_measure_ethanol_concentration_in_small_volumes
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