1. The problem statement, all variables and given/known data Hi everyone. I'm teaching introductory chemistry this semester, but I don't have much of a chem background. We are about to start acid base titrations. Does the standard solution of known concentration go in the buret tube or the erlenmeyer flask? Does it matter? 2. Relevant equations 3. The attempt at a solution In my lab, the acid has the unknown concentration, while the base's concentration is known. I have it set up so that the acid is in the erlenmeyer flask and the base is in the buret tube. This is convenient because the indicator is colorless in the acid but pink in the base. However, would there ever be a situation where solution with the known concentration would be in the erlenmeyer flask?