I want to make a sample for proton NMR signal-to-noise-ratio measurement. It is conventional to use 1% ethylbenzene in d-chloroform, as specified here.
I have two questions:
What is meant exactly, by 1% ethylbenzene? In some places, I see the notation (v/v), which I take to mean 1% by volume. However, I am still not clear what this means. Does it mean that an amount of ethylbenzene should be used that would fill 1% of the final volume when the solvent is not present? Or does it mean to fill 99% of the final volume with the solvent and then add ethylbenzene until I reach the total volume? Or something else?
What is a good procedure for making such a solution? I imagine a volumetric flask would be useful, but should the solute be measured out by weight? Or using a pipette? I only need about 10 mL of the final solution.