Please guide me : i have 0.5 grams of solid waste sample. It is acid digested and then diluted to 500 ml. This is tested for chromium by atomic absorption and the conc came out to be .243 mg/l. what will be the actual concentration in the solid sample?

Answer 1
By atomic absorption it is determined that the conc of chromium in 500 mL solution is #0.243" mg/L"# .
So the mass of chromium present in 500mL or 0.5L solution will be #0.243"mg"/Lxx0.5L=0.1215mg#
And this amount of chromium has come from #0.5g=500mg# of solid waste sample.

Thus, the solid waste sample's chromium percentage is

#=0.1215/500xx100%=0.0243%#
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Answer 2

To calculate the actual concentration of chromium in the solid sample, you need to use the dilution factor. First, convert the concentration from mg/L to mg/mL. Then, multiply the concentration by the dilution factor, which is the ratio of the final volume to the initial volume. Finally, convert the result back to grams. The calculation is as follows:

Concentration in mg/mL = 0.243 mg/L = 0.243 mg/0.5 L = 0.486 mg/mL

Dilution factor = Final volume / Initial volume = 500 mL / 0.5 mL = 1000

Actual concentration in the solid sample = Concentration in mg/mL * Dilution factor = 0.486 mg/mL * 1000 = 486 mg/kg

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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