Allium cepa L and Allium sativum L as olfactory indicators for acid-base olfactory titration for visually impaired chemistry students
- Author Rev Andy N. Moses
- Co-Author Sofeme R. Jebson
- DOI https://ww
- Country : Nigeria
- Subject : Chemistry
Keywords : Allium cepa L, Allium sativum L,, Acid-Base Olfactory Titration, Methyl Orange and Phenolphthalein.
Abstract
The use of Allium cepa L and Allium sativum L bulbs extract as olfactory indicators for visually impaired Chemistry students as an alternative to Methyl Orange and Phenolphthalein indicators have been established.
It is confirmed that Allium cepa L and Allium sativum L extracts are a better substitute for synthetic indicators in Strong Acid-Strong Base titration for concentrations of 0.1M, 0.5M, 1M and 2M HCl and NaOH respectively.
The mean titre values for titration of 0.1 M HCl and 0.1M NaOH using Allium cepa L and Methyl orange were 15.1667 and 15.1333 with S.D Error of 0.06667, signifying that Allium cepa L can replace Methyl orange. The mean titre values for all the indicators used for 0.5M HCl: 0.5M NaOH showed a great significant difference.
For titration of 1M HCl:1M NaOH, the mean titre values of 2.9667 for Allium cepa L.; 3.0667 for Allium sativum L; 3.2000 for Phenolphthalein and 3.1333 for Methyl orange were recorded. The results revealed an almost total concordant. Interestingly, the mean titre values of 2M HCl: 2M NaOH were Allium cepa L = 5.000; Allium sativum L = 5.000 and Phenolphthalein = 5:000, thus the two indicators can replace Phenolphthalein. The mean titre value using Methyl orange for the same 2M concentrations of HCl: NaOH was 24:000, Thus there is a very significant difference in the mean titre values. Allium cepa L and Allium sativum L bulbs extracts are of economic benefits as there are affordable, bioavailable, bioactive, ecofriendly, ease of preparation, and gives accuracy and same precision with the synthetic indicators.
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