A ballpark titration is a technique used to determine an approximate volume of titrant needed to reach the endpoint or color change of the titration. In the Erlinmeyer you will use the same volume of analyte solution as you will use in your subsequent real titration. To perform a ballpark titration open the stop cock fully and let the titrant drain while swirling the Erlinmeyer until the endpoint is reached. You are not looking for an accurate volume just the approximate volume needed to reach the endpoint. Please remember you still read the burette to the hundreds place. You want to stop the flow of titrant when the indicator changes color but it's okay if the indicator is too dark as you've now learned the approximate volume needed to reach the endpoint. This allows you to work more efficiently by adding titrant quickly at the beginning of your real titrations and only slow in when you are within a few milliliters of the endpoint.