A solution that is "0.0001 Molar" (often written as 0.0001 M) contains 0.0001 moles of a solute dissolved in one liter of solvent, typically water. Molarity is a common way to express the concentration of a solution, indicating how much of a substance is present in a given volume. For example, if you have a salt solution with a concentration of 0.0001 M, it means that for every liter of that solution, there are 0.0001 moles of salt. This low concentration is often used in scientific experiments, such as those involving chemistry or biochemistry, where precise measurements are crucial.