Titration Procedure

Introduction

• The video is aimed at students studying triple chemistry as a required practical.
• Likely to be a specific question on titration in exams.

What is Titration?

• Titration is a method to determine the concentration of an acid or base.
• It involves a neutralization reaction; example: sulfuric acid with sodium hydroxide.
• Knowing the volume of acid that neutralizes the base allows calculation of the acid's concentration.
• The procedure is straightforward, and calculations are covered in a subsequent video.

Procedure Stages

1. Transfer Sodium Hydroxide

   • Use a pipette to transfer 25 cm³ of sodium hydroxide (alkali) into a conical flask.
   • The conical flask helps reduce splashing.
   • Use a pipette filler to draw liquid, and allow it to drain naturally; do not blow it out.

2. Add Indicator

   • Add 5 drops of an indicator, e.g., methyl orange, to the alkali in the conical flask.
   • Alternative indicators like phenolphthalein can be used.

3. Prepare for Observation

   • Place the conical flask on a white tile to see color changes more clearly.

4. Fill Burette with Acid

   • Fill a burette with sulfuric acid.

5. Add Acid to Alkali

   • Add acid until the solution is neutral.
   • Methyl orange will change from yellow to red.
   • Add acid drop by drop as the color change begins.
   • Swirl the solution to ensure proper mixing.

6. Read Burette

   • Reading the burette correctly is crucial.
   • Eye level should be aligned with the liquid's surface.
   • Read at the bottom of the meniscus (the curve of the liquid surface).
   • Example reading: 17.9 cm³

7. Repeat and Calculate

   • Repeat titration multiple times to get two readings within 0.1 cm³ of each other.
   • Calculate the mean of consistent readings for the final volume.

Outcome

• Knowing the volume and concentration of the alkali and the volume of acid allows for calculation of the acid’s concentration.
• Calculations for this are covered in the next video.

Additional Resources

• Further questions on titration are available in a revision workbook offered by the presenter's website.