OCR GCSE Combined Science A · J250
Specification C2.1g · Chemistry Paper 1
Revise: Chromatography TechniquesA locating agent makes their positions visible after the chromatography has taken place.
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GCSE Combined Science · key term
A chemical used after chromatography to make the positions of colourless substances visible.
Used by OCR
Specification C2.1g · Chemistry Paper 1
Revise: Chromatography TechniquesA locating agent makes their positions visible after the chromatography has taken place.
Chemistry, Combined Science
A chemical used to make colourless spots on a chromatogram visible.
A locating agent reveals colourless substances after separation. It is not the solvent used to carry them up the paper or plate.
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Locating agents, such as ninhydrin or iodine, can make colourless spots visible. Suitable substances may also be detected under ultraviolet light. Use locating chemicals under teacher supervision, avoid inhaling vapours, and do not look directly into a UV source.