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Working with concentration and weight taken

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I prepared a 1.0 mM solution of Benzoic Acid in methanol and I now need to convert it to 50ppm. ????
How???

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We have Molarity = Moles of solute/liter of solution

Molarity is defined as the number of moles of solute per liter of solution. Notice it means per liter of solution, not per liter of solvent. Therefore, the solute is dissolved in enough solvent to make a specified ...

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