Is this the correct procedure for cleaning volumetric glassware prior to making a measurement: first, rinse with tap water. second, rinse with deionized water from your wash bottle. finally, rinse once (or preferably twice) with the solution you are going to be measuring. dispose of these rinses in your waste beaker?

True.

Explanation:

Hello,

In this case, the first step allows us to dissolve and remove primary residues such as solids or other unsoluble liquids. Next, the deionized water allows us to remove traces of ionized chemical species such as cations or anions. Finally, such rinsing is useful to adapt the volumetric glassware for the experiment to assure no previous substances to be present.

In addition, the residues of those rinses should be disposed on a waste beaker for further treatment or storage.

Best regards.