How can you prepare 1mm from 100mm NaNO2?

Answer 1

Unfortunately, sodium nitrate is a solid salt, and you can't really measure a solid (three dimensional object) in millimeters, which is a measure of length.

Answer 2

To prepare 1mm solution from 100mm NaNO2, you will need to dilute the stock solution by a factor of 100. You can do this by taking 1 mL of the 100mm solution and diluting it to a total volume of 100 mL with the appropriate solvent (such as water).