CAIE A-Level Chemistry A2 37.1.2 Rf Values

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A student uses thin-layer chromatography (TLC) to analyse a mixture containing different metal cations. The student repeats the experiment using different solvents.

Fig. 6.1 shows the chromatogram obtained by the student using water as a solvent.

Fig. 6.1

Table 6.1 shows the $R_{\mathrm{f}}$ values for different metal cations when separated by TLC using water as a solvent.

Table 6.1

Suggest the identity of the cation that causes the spot at M in Fig. 6.1.

Explain your answer.

$\mathrm{Cd}^{2+}$ AND $R_{\mathrm{f}}$ of M(=2 / 5)=0 . 4 0 / same $R_{\mathrm{f}}$ as in the Table 6.1

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CAIE A-Level Chemistry A2 37.1.2 Rf Values Topic Practice

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