Question

The reaction of SnCl2(aq) with RhCl3(aq) in aqueous HCl yields a red solution of a 1∶1 Rh–Sn compound. If a solution prepared by adding 150 mL of a 0.272 mM aqueous solution of SnCl2 to 50 mL of an aqueous solution of 8.5 mg RhCl3 has an absorbance of 0.85, as measured in a 1.00 cm cell, what is the molar absorptivity of the red compound?

Answer 1

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Answer 2

Several papers in the primary literature describe the use of absorption spectroscopy in quantitative analysis.

Pharmacological testing, organic compound purity assessment, clinical analysis, and trace metal analysis are all common applications. In the dilute HCl, SnCl 2(aq) combines with RhCl 3(aq) to form a red solution of a 1:1 Rh-Sn molecule. If the absorption coefficient produced by mixing 150 mL of a 0.272 m M aqueous solution of SnCl 2 with 50 mL of an acidic suspension of 8.5 mg RhCl 3 in a 1.00 cm cell is 0.85 M-1 cm-1.