Fill in the burette to the zero ("0") mark with the standard solution of the titrant; e.g., 0.2 molar solution of sodium hydroxide.
Add a 10 ml aliquot of the solution with the unknown concentration of the compound (e.g., hydrochloric acid, HCl) to the flask.
Add approximately 100 ml of distilled water to the flask and swirl the flask for 2 to 3 seconds to mix the solution.
Place the glass electrode of the pH meter to the solution in the flask. Write down the initial pH of the solution.
Add 2 to 3 drops of the titrant solution from the burette to the flask.
Swirl the flask for 2 to 3 seconds to mix the solution. Record the pH value. Note: you should see a smooth and steady increase of the solution pH.
Repeat Steps 5 and 6 until you see a very rapid pH jump by 3 to 4 units. This is the titration endpoint.
Record the volume of the standard solution of sodium hydroxide used for titration.