Posted by Anon on Thursday, December 6, 2012 at 12:38am.
I still don't know what "in the option" means; however, if the concn is 15.8 mg/L in the measured sample, then multiplying by any dilution factor leaves the concn in mg/L and you do not need to multiply by anything.
But when you times (100mL/25mL) you get 4mL. Then you times 4mL times 15.8 mg/L and it doesn't cancel out the mL.
What in the world are you talking about?
15.8 mg/L x (100 mL/25 mL) = 15.8 mg/L x 4 = 63.2 mg/L. (100 mL/25 mL) is 100 mL DIVIDED by 25 mL and that is 4. The mL of 100 and the mL of 25 cancel to leave a pure number x 15.8 mg/L to leave units of mg/L).
The units are mg/L x (mL/mL) = mg/L.
Ok. I thought 100mL/25mL=4mL. Thanks
I finally caught on to what you're doing. Your error is you think (100 ml/4 ml) = 4 mL. It isn't. It is 4. The mL in the top cancels with the mL in the bottom to leave a unitless number of 4.00
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