Pre-Lab Experiment 2: Titration

Define molarity.

• Molarity is the number of moles of solvent per litre of solution.

• Molarity is the number of moles of solute per kilogram of solvent.

• Molarity is the number of moles of solute per litre of solution.

What is standard solution?

• Standard solution is a solution that is standard.

• Standard solution is a solution of accurately known concentration.

• Standard solution is a solution containing one gram equivalent weight of the solute dissolved per litre.

• Standard solution is a type of solution which contains the maximum solute.

What is the use of a standard solution?

• A standard solution is used to determine the concentration (molarity) of the other substances such as solution in titration.

• A standard solution is used to determine the volume of the other substances such as solution in titration.

• A standard solution is used to determine the usability of the other substances such as solution in titration.

• A standard solution is used to determine the chemical property of the other substances such as solution in titration.

What is the difference between end point and equivalence point?

• End point is the point at which the indicator changes colour.

  
  

  Equivalence point is the point at which exact reaction occurs between the two reagents according to stoichiometry.

• End point is the point at which exact reaction occurs between the two reagents according to stoichiometry.

  
  

  Equivalence point is the point the indicator changes colour.

How to determine the end point of the titration?

• The end point is reached when the pale pink color appears and persists for more than 30 seconds.

• The end point is reached when the pale pink color appears and persists for less than 30 seconds.

• The end point is reached when the pale pink color appears and persists for more than 60 seconds.

What is the function of white tile in titration?

• To help clearly see the colour change in conical flask.

• To protect the conical flask.

• To add extra height.

• To assist the reaction.

How to ensure that you will get an accurate final end point?

• Titrate quickly.

• Repeat the titration 3 times.

• Do not rinse the burette.

• Always use the same pipette filler.

Why it is important to rinse the unreacted solutions at the inner wall of the conical flask with distilled water (Step number 7 in Experiment 2 Part B lab manual) ?

• To help the reaction go faster.

• To dilute the reagents.

• To ensure accuracy (all solution reacts).

• To see the colour of the indicator better.

Which eye position (level) is correct when taking a reading of a meniscus?

• A

• B

• C

Name the lab apparatus in the picture.

• Conical flask.

• Volumetric flask.

• Pipette.

• Burette.