Burette

Fill a burette with the acid and record its initial reading. The pipette gives an accurately measured starting volume; the burette can deliver acid in variable amounts and show how much has been added. The acid and alkali can be exchanged between the flask and burette: what matters is knowing which volume was fixed and which was delivered.

Clamp a burette vertically above the flask and fill it with hydrochloric acid. Run a little acid through the tap so that the tip fills and contains no air bubbles. Remove the filling funnel before taking a reading.

A burette has a graduated scale and a tap. Its scale starts near zero at the top and increases downwards. Record the initial reading, deliver liquid using the tap, and record the final reading.