To determine the strength of a weak acid (acetic acid) and a strong acid (hydrochloric acid) in a mixture using conductometric titration with a strong base (sodium hydroxide).

Preparation of Solutions:

    1. Prepare the Acid Mixture Solution:
      1. Prepare a solution that contains both hydrochloric acid (HCl) and acetic acid (CH₃COOH) in known concentrations, or use a pre-prepared mixture.
    2. Prepare the Base Solution:
      1. Fill the burette with 0.1 M sodium hydroxide (NaOH) solution.

Procedure
  • Set up the conductivity meter according to the manufacturer's instructions. Rinse the electrodes with distilled water and calibrate the meter if necessary.
  • Fill the burette with 0.1 M NaOH solution and record the initial volume.
  • Pipette 10 mL of the acid mixture (acetic acid + HCl) into a 100 mL beaker and add approximately 40 mL of distilled water.
  • Place the beaker containing the acid mixture on a magnetic stirrer and add a stir bar (if available). Ensure constant stirring during the titration to maintain uniformity.
  • Immerse the conductivity electrode into the acid mixture. Ensure that the electrodes are fully submerged but do not touch the sides or bottom of the beaker.
  • Record the initial conductivity of the acid mixture.
  • Gradually add NaOH from the burette to the acid mixture in small increments (e.g., 0.5 mL) while continuously stirring.
  • After each addition, wait for the conductivity to stabilize, and then record the conductivity and the corresponding volume of NaOH added.
  • Continue adding NaOH until the conductivity shows two distinct changes: