Purpose: find pH and [acid]

Procedure:

1. Crush A.S.A until it becomes a powder.

2. weigh the crushed A.S.A.

3. Dissolve in 50 mL of water; filter.

4. Prepare burette with 50 mL of 0.1 M NaOH.

5.add 10 mL of A.SA solution to a beaker, add 3 drops of phenolphthalein.

6. Titrate the A.S.A with the NaOH.

Data:

[OH]=(0.0009*0.1)/0.0104=8.65*10^-3

when neutralized during titration, the pH is 7, therefore [OH]=[H30]=[A.S.A]

therefore, the pH=-log[8.65*10^-3]=2.1