Molecular Spectroscopy
Product Code : EL-AS-11139
Last updated: 6 October 2026
Quick answer: A laboratory investigation into molecular spectroscopy and how electromagnetic radiation interacts with molecular compounds, available as either a guided or an open inquiry activity, using primary-colour food dyes to determine optimum wavelength and the effect of concentration.
Food dyes are the right choice of sample for teaching absorption spectroscopy: they are cheap, safe, intensely coloured and available in the primary colours, so the relationship between the colour you see and the wavelength absorbed is immediately visible before any instrument is involved.
The kit is supplied in two versions of the same investigation, which is its distinguishing feature. In the guided activity, students graphically determine the optimum wavelength, lambda max, for primary-colour food dyes, and identify those dyes in mixtures using percent transmittance and absorption measurements. In the inquiry activity, they are instead asked to develop the procedure themselves, for identifying the wavelength of maximum absorbance and minimum transmittance, and for determining whether dye concentration affects the result. The same equipment therefore serves a class being taught the method and a class being asked to design it.
Identifying dyes in mixtures is the part that makes this analytical rather than descriptive: a mixture has overlapping spectra, and separating the contributions is what spectroscopy is actually used for.
The listing description is cut off mid-sentence. It does not state whether a spectrophotometer or colorimeter is included or required, which is the decisive question, nor the class size supported, the dyes and quantities supplied, or the grade level. Request all of these before ordering, since a spectroscopy kit without an instrument is only half a purchase.
Technical specifications
Specification | As published |
Product type | Spectroscopy investigation kit, guided and open inquiry |
Subject | Molecular spectroscopy; interaction of electromagnetic radiation with molecular compounds |
Activity versions | Guided activity and inquiry activity |
Samples | Primary-colour food dyes |
Guided activity tasks | Graphically determine lambda max; identify dyes in mixtures using percent transmittance and absorption measurements |
Inquiry activity tasks | Develop a procedure for identifying the wavelength of maximum absorbance and minimum transmittance, and for testing whether concentration affects results |
Also investigated | Whether the concentration of a compound in solution affects emission and absorption spectra |
Supplied from | Ambala, Haryana, India |
Only what this listing publishes is recorded above, and the published description is cut off mid-sentence. Critically, it does not state whether a spectrophotometer or colorimeter is supplied or must be provided separately, nor the class size supported, the dyes and quantities included, or the grade level. Confirm the instrument requirement in writing before ordering.
Range and ordering
This item belongs to the Atomic Structure family within Biotechnology Equipment and Labware, part of the Biotechnology range. Packaged teaching kits are listed under Biotechnology Kits. Bulk, tender and OEM quantities are handled through lab tenders and OEM orders; use the contact page to request a quotation or any specification noted above.