You have been asked to run a jar tests to determine the amount of coagulant will be required to treat drinking water from a lake. The concentration of the coagulant in your lab is 2000 mg/L and you are working with the standard 1L sample volume. How much of the stock solution must you add to the sample If the coagulant concentration desired in your specific test is 20 mg/L, the quantity (mL) of the stock solution must you add to the sample is most nearly: