SC-820
Chromatography
Lower Sec Science · Secondary 1 · Medium · Chromatography
A student places a spot of black food colouring on a pencil line near the bottom of chromatography paper and dips the paper in water. Several coloured spots appear at different heights. What does this show?
- The dyes in the colouring have different solubilities in the water.
- All dyes in the colouring are insoluble in water.
- Water has chemically changed all the dyes into new substances.
- All dyes in the colouring have exactly the same solubility.
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