I\'m not sure if someone can answer this because it\'s from a lab. I think it\'s

Question

I'm not sure if someone can answer this because it's from a lab. I think it's more of a how do I do this, type of question

Ok, picking it up from the last question. It says, if this 2.0 ppm dilution is still measurable, the detection limit for STD-B is less than 2 ppm. You cant add more than 7.0 mL to a test tube cause it will overflow. So, for a more dilute sample, you have to use the 50 mL wide mouth flask in the lab.

Calculate the volume of solvent solution that must be added to 1 mL of the 10.0 ppm STD-A drug standard to prepare a 1.0 ppm solution of STD-A. What would the result be?

? mL

Explanation / Answer

We are preparing a 1.0 ppm solution.

The stock solution concentration is 10.0 ppm.

So, the dilution is 10 times.

Thus if stock solution volume is 1 mL the final volume will be 10 mL.

So, volume of solvent to be added is (10 - 1) = 9 mL.

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