A sample (50 mL) of a bottled water was added to a 100 mL volumetric flask and then diluted to the mark. From this stock solution, 50 mL was taken, added to a 100 mL volumetric flask and diluted to the mark. Final concentration of the serial dilution: 587.7161ppm. 1. what is the concentration in the original bottle (ppm)

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A sample (50 mL) of a bottled water was added to a 100 mL volumetric flask and then diluted to the mark. From this stock solution, 50 mL was taken, added to a 100 mL volumetric flask and diluted to the mark. Final concentration of the serial dilution: 587.7161ppm.

1. what is the concentration in the original bottle (ppm)

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The dilution takes place twice. First the original sample (50 mL) is diluted to 100 mL stock solution. Then 50 mL of stock solution is diluted to 100 mL solution with concentration = 587.7191.

Concentration of the stock solution can be determined using the expression for dilution is,

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