Acid Base Titrations

Aim.
To determine the molarity of Na CO solution using H SO solution by volumetric analysis.
Apparatus.
Burette, conical flask, pipette, Bunsen burner, test tube, H SO solution, Na CO solution, methyl orange indicator.
Procedure.
1. Fill the burette with the H SO solution of known molarity.
2. Pipette out a known volume of Na CO solution into the conical flask.
3. Add a few drops of methyl orange indicator.
4. Titrate the H SO solution into the Na CO solution until a color change from yellow to red is observed.
5. Record the volume of H SO used.
Calculation.
Using the equation: Where: - = Molarity of H SO - = Volume of H SO used - = Molarity of Na CO (unknown) - = Volume of Na CO used Since the reaction is 1:1, the equation simplifies to:

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: Where: - = Molarity of NaOH - = Volume of NaOH used - = Molarity of HCl (unknown) - = Volume of HCl used Since the reaction is 1:1, the equation simplifies to: