- Solid Drano

- Distilled water

- 0.1 M hydrochloric acid (HCl)

- Buret

- 250-mL beaker

- Magnetic stir plate

- Magnetic stir bar

- pH meter

Procedure:

1. Weigh approximately 1 gram of solid Drano and record the exact mass.

2. Transfer the solid Drano to a 250-mL beaker.

3. Add 100 mL of distilled water to the beaker and stir until the solid Drano is completely dissolved.

4. Place the beaker on the magnetic stir plate and turn on the stirrer.

5. Add 0.1 M HCl solution from the buret slowly to the beaker while stirring continuously.

6. Monitor the pH of the solution using the pH meter.

7. Continue adding HCl solution until the pH reaches 7.0 (neutral).

8. Record the volume of HCl solution added from the buret.

Calculations:

1. Calculate the number of moles of HCl used:

Moles of HCl = Concentration of HCl (M) × Volume of HCl added (L)

2. Calculate the number of moles of NaOH in the solid Drano:

Moles of NaOH = Moles of HCl (since the reaction between NaOH and HCl is 1:1)

3. Calculate the percentage of NaOH in solid Drano:

Percentage of NaOH = (Moles of NaOH / Mass of solid Drano) × 100%

Note:

The percentage of NaOH obtained from this experiment may not be 100% due to the presence of other components in solid Drano, such as fillers or additives.