Equipment:

- Data collection system

- pH sensor

- Magnetic stirrer

- Erlenmeyer flask

- Ring stand

- Beaker (2), 100-mL

- Beaker (2), 10-mL

- Volumetric flask, 100-mL

- Clamp, right-angle

- Potassium hydrogen phthalate (KHP), 0.6 g

- Sodium hydroxide (NaOH), 0.40 g

- Buffers, pH 4 and pH 10, 10 mL

- Water, deionized, 250 mL

- Wash bottle with deionized water

- Kim wipes

- Titration jar (3), 180-mL

- Automatic titrator

Safety:

- NaOH is caustic. If NaOH get on your skin, rinse the exposed surface thoroughly with running water.

Procedure:

1. Start recording data

2. Press the "Run" button on the Titrator to start the titration

3. Continue the titration past the equivalence point until the pH curve flattens

4. Stop recording data

5. Repeat the titration procedure with two more KHP samples. Record the mass of the samples in.

6. Once you determine the concentration of the NaOH solution, label the solution and place it in a safe place for use in the "Acid-Base Titration" activity

7. Save your experiment and clean up according to your teacher's instructions

8. Print the graph

9. Clean the syringe in the Titrator

Primary Data:

Mass of NaOH: 4.213 g

Expected Concentration: