Lifelong Learning Programme

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Experiences

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Title of the Experience
The primary tastes
Country where it took place
Romania
School typology
Lower Secondary School
Thematic Area
Science
Experience typology
Laboratory
Type of contact
Description of the Experience
For teaching students the perception limits of the four basic tastes, I have made water solutions with sugar, salt, citric acid and caffeine in known concentrations (2,4,6,8 g of sugar; 0,2, 0,4, 0,6, 0,8 g of salt; 0,3, 0,6, 0,9, 1,12 g of citric acid and 0,05, 0,1, 0,15, 0,2 g of caffeine). A total of 16 samples were obtained. One control water solution (only water) was also supplied.
The students each had in front of them 5 glasses. The sugar solutions were poured, in an unknown order. The students had to re-order the glasses according to the intensity of the taste. The same protocol was applied for each of the remaining 3 groups of solutions. The students showed different perception limits, which can increase by exercise.

If applicable, please try to highlight how the chosen solution increased the interest of the student towards science.

The students kept exercising and testing their senses to see at which concentration of sugar, salt, citric acid or caffeine they felt nothing – perception threshold.

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