When using a 100-mL volumetric flask to prepare a solution, you must Place the material to be dissolved into the flask, then add 100.00 mL of water. Place the material to be dissolved into the flask, then add water until the meniscus reaches the line on the neck of the flask. Place 100.00 mL of water in the flask, then add the material to be dissolved. Place the material to be dissolved into the flask, then add mL water up to the bottom of the stopper.