A student investigated the colours in three different flowers, A, B and C.  The colours are soluble in ethanol but are insoluble in water. This is the method used. 1. Crush flower A. 2. Add ethanol to flower A. 3. Filter the mixture. 4. Put spots of the coloured filtrate on to the chromatography paper. 5. Repeat steps 1-4 with flowers B and C. Figure 1 shows the apparatus used. The student made two mistakes in setting up the apparatus. Give one problem caused by each mistake.- 6130

One thought on “A student investigated the colours in three different flowers, A, B and C.  The colours are soluble in ethanol but are insoluble in water. This is the method used. 1. Crush flower A. 2. Add ethanol to flower A. 3. Filter the mixture. 4. Put spots of the coloured filtrate on to the chromatography paper. 5. Repeat steps 1-4 with flowers B and C. Figure 1 shows the apparatus used. The student made two mistakes in setting up the apparatus. Give one problem caused by each mistake.- 6130”

1. The start line was drawn in ink, but it should have been drawn in pencil because ink dissolves in water. Pencil does not dissolve or run in the solvent, so the results would be more accurate. Water was used as the solvent in the beaker. Because the line was in ink, the colours may dissolve or move, which could affect the outcome.

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