Allium cepa L as Olfactory Indicators for Acid-Base Olfactory Titration for Visually Impaired Chemistry Students
- Author Andy N. Moses
- DOI https://ww
- Country : Nigeria
- Subject : Chemistry
Keywords : Allium cepa L, Olfactory indicator, Acid-Base Olfactory Titration, Methyl Orange and Phenolphthalein.
Abstract
The study sought to use Allium cepa L bulbs extracts as olfactory indicators for visually impaired Chemistry students as an alternative to visual indicators like Methyl Orange and Phenolphthalein. In this study varying concentrations of Allium cepa L olfactory indicator extracts as substitute for Methyl Orange and Phenolphthalein in Strong Acid-Strong Base olfactory titration for students with visually impaired for concentration of 0.1M, 0.5M, 1M and 2M HCl and NaOH respectively were used. The results of the study revealed that the mean titre values for olfactory titration of 0.1M HCl and 0.1M NaOH using Allium cepa L olfactory indicator and Methyl orange visual indicators were 15.1667 and 15.1333 with S.D Error of 0.06667, signifying that Allium cepa L olfactory indicator can conveniently replace Methyl orange in 0.1M HCl: 0.1 M NaOH olfactory titration. The mean titre values for all the indicators used for olfactory titration of 0.5M HCl: 0.5M NaOH showed a great significant difference. For the olfactory titration of 1M HCl:1M NaOH, the mean titre values of 2.9667 for Allium cepa L olfactory indicator; 3.0667 for Phenolphthalein and 3.1333 for Methyl orange indicators were recorded. The results revealed an almost total agreement, signifying that at a molar concentration of 1, the Allium cepa L olfactory indicators can equivocally replace Phenolphthalein and Methyl Orange indicators in Olfactory strong acid- base titration.
Interestingly, the mean titre values for olfactory titration of 2M HCl: 2M NaOH using olfactory indicators and Phenolphthalein were, Allium cepa L olfactory indicator = 5.000; and Phenolphthalein = 5:000, showing that Allium cepa L olfactory indicators can be used as an alternative to Phenolphthalein indicator in strong Acid – strong Base olfactory titration for concentrations of 2M. The mean titre value for using Methyl orange for the same 2M concentrations of HCl: NaOH olfactory titration was 24:000, almost five times greater that of the two indicators. Thus, there is a very significant difference in the mean titre values of Allium cepa L olfactory indicator and that of Methyl orange.
It is also concluded that the use of Allium cepa L bulbs extract as olfactory indicator in strong acid- strong base type olfactory titration is of economic benefits as it is affordable, bioavailable, bioactive, ecofriendly, ease of preparation, non-carcinogenic and gives accuracy and very near or same precision with visual indicators like Methyl orange an Phenolphthalein. The uniqueness in the application of Allium cepa L olfactory indicators in determining the end point of titration is that, as the reaction progresses to completion, it gives a strong and more stringent steady ordour.
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