Co(II) was used as an internal standard to analyze a sample of Ti(IV) with atomi

Question

Co(II) was used as an internal standard to analyze a sample of Ti(IV) with atomic absorption spectroscopy (AAS). A standard mixture containing 1.98 g Co/mL and 1.94 g Ti/mL measured by AAS produced a signal-to-signal ratio of 2.58 Ti: 1.00 Co. A mixture was prepared by combining 4.00 mL of a Ti(IV) solution of unknown concentration with 3.00 mL of a 10.0 g/mL solution of Co(II). The absorbance of the mixture at the Ti(IV) wavelength was 0.124 and the absorbance at the Co(II) wavelength was 0.200. Determine the concentration, in moles per liter, of Ti(IV) in the original unknown solution

Explanation / Answer

Amount of Co on unknown solution is 4.286 ug/mL. Then signal to signal ratio on unknown solution is 0.62 Ti / 1 Co. Finally 0.62 / 1 = X Ti ug/mL / 4.286 ug/mL Co which leads to X = 2.657 . 10-6 g. Molar concentration of Ti(IV) is 5,547 . 10-5 mol/L.

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