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An unknown solution containing caffeine was found to have a concentration of 1.00 × 10⁻⁵ M. If the unknown solution was made by diluting the original sample solution by adding 0.8 mL of the original sample to a 100 mL volumetric flask and making up to the mark with deionized water, what is the concentration of caffeine in the original sample solution?
Sagot :
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