AAS Calculations Question (1 Viewer)

[NichNich]

Does anyone know how I go about in doing this question please? Been annoying me for the past few hours... many thanks

A sample of marlin flesh was analysed to determine its mercury concentration. A 2.00 g sample was digested and made up to 100.00 ml of solution. This was then analysed using an atomic absorption spectrometer, and the standard Hg concentration was 0.3 ppm for the dilute sample. Calculate the concentration of mercury in the orginal mercury sample in ppm.

Many thanks in advance! And does anyone know whether this type of questions are in the syllabus?

 

[shazzam]

Assuming that the mass of the sample in solution is negligible, and equating grams and mLs ie 1g=1mL

100/2=50 ie the solution is 50times more dilute than the original sample
[Hg in sample] = 50*0.3=15ppm

These types of questions usually occur in school assessments, though they might occur in more detailed form and with larger weighting in the external examination.