Question

Determine the molarity of HCl solution with the help of supplied NaOH solution by volumetric analysis method.

Hint:

Always perform titration slowly near the endpoint to avoid overshooting the pink color.

Answer 1

Aim.
To determine the molarity of HCl solution using NaOH solution by volumetric analysis.
Apparatus.
Burette, conical flask, pipette, Bunsen burner, test tube, NaOH solution, HCl solution, phenolphthalein indicator.
Procedure.
1. Fill the burette with the NaOH solution of known molarity.
2. Pipette out a known volume of HCl solution into the conical flask.
3. Add a few drops of phenolphthalein indicator.
4. Titrate the NaOH solution into the HCl solution until a persistent pink color appears.
5. Record the volume of NaOH used.
Calculation.
Using the equation: \[ M_1V_1 = M_2V_2 \] Where: - \(M_1\) = Molarity of NaOH - \(V_1\) = Volume of NaOH used - \(M_2\) = Molarity of HCl (unknown) - \(V_2\) = Volume of HCl used Since the reaction is 1:1, the equation simplifies to: \[ M_1V_1 = M_2V_2 \]