Titration Techniques and Procedures

This video tutorial explains the process of determining the concentration of a potassium permanganate (KMnO4) solution using ferrous ammonium sulfate (Mohr's salt) through titration. It covers the materials required, preparation of a standard Mohr's salt solution, the titration procedure, calculations for determining the strength of KMnO4, and necessary precautions to ensure accurate results.

What is the purpose of adding concentrated sulphuric acid to Mohr's salt crystals during the preparation of its standard solution?

• To prevent hydrolysis of ferrous ions

• To enhance the color change at the end point

• To increase the volume of the solution

• To neutralize the solution

Which of the following is NOT a material required for the titration process?

• 250ml graduated cylinder

• 250ml standard flask

• 250ml conical flask

• 20ml pipette

How much Mohr's salt is required to prepare a 250 ml, 0.05 molar standard solution?

• 6.9 grams

• 4.9 grams

• 3.9 grams

• 5.9 grams

What is the first step in preparing the standard solution of Mohr's salt?

• Measuring concentrated sulphuric acid

• Taring the electronic balance

• Weighing the Mohr's salt

• Adding distilled water

What is the molarity of the prepared Mohr's salt solution?

• 0.15 M

• 0.01 M

• 0.05 M

• 0.10 M

What is the purpose of rinsing the burette with potassium permanganate solution before filling it?

• To ensure accurate volume measurement

• To calibrate the burette

• To remove impurities

• To remove air bubbles

During the titration, what indicates the end point?

• The solution turns light pink

• The solution turns yellow

• The solution turns green

• The solution turns blue

Why should the titration flask not be rinsed with the solution to be titrated?

• It may cause contamination

• It may introduce air bubbles

• It may cause a color change

• It may alter the concentration

What should be used to ensure accurate color change detection during titration?

• A black tile

• A white tile

• A blue tile

• A red tile

Which of the following is a precaution to be taken while using a pipette?

• Blow out the last drop of solution

• Use the thumb to close the mouth of the pipette

• Always keep the lower end of the pipette in the liquid

• Use a pipette with a rubber tap