For example, if I wanted to make a 200 milliliters of sodium chloride with a concentration of 5 M, how much of the compound would I use? Remember that Molarity actually stands for moles per Liter. That means I’m going to have to convert 200 milliliters to liters. On our metric line, there were three places between milli and the base unit, so we will have to move our decimal three places to the left. That means 200 milliters is 0.2 L. Now we can plug our numbers into our formula. According to my formula, the number of grams I need will be 5M x 0.2L x 58.44 g/mol. After canceling units and multiplying these three numbers together, I get the answer 58.44g. My balance goes to 2 decimal places, that means that I will weigh out 58.44 grams of NaCl and add 0.2 L or 200 millilters of water. When making a stock solution, we usually dissolve the solid in about two-thirds volume of water. So that means we would dissolve our 58.44 g of NaCl in only about 150 mls of water and stir. When it is completely dissolved, we would transfer the solution to a graduated cylinder and bring it to the final volume of 200 milliliters.