SK015 PRE-LAB2 ACID BASE TITRATION

What is molarity (M) of solution?

• Mass of solute per volume of solvent

• Number of moles of solute per volume of solution in litre

• Volume of solute per mass of solvent

• Grams of solute per liter of solvent

What is a standard solution?

• A solution that conducts electricity

• A solution with unknown concentration

• A solution of accurately known concentration

• A solution that contains only one type of molecule

What is the end point in a titration?

• The point at which the number of moles of acid equals the number of moles of base

• The point where the colour of the indicator changes

• The exact point at which neutralization occurs

• The point where the solution reaches its maximum temperature

What is the equivalence point in a titration?

• The point where the solution becomes colorless

• The point at which the indicator is added

• The point at which the number of moles of acid equals the number of moles of base (complete neutralisation)

• The point where excess base is present in the solution

Why is it important to swirl the conical flask during titration?

• To keep the temperature constant

• To prevent the reaction from completing

• To ensure the acid and base mix evenly

• To avoid spilling the base

What color change indicates the end point when using phenolphthalein?

• Blue to red

• Colorless to pink

• Yellow to green

• Red to colorless

Why is a burette rinsed with NaOH before titration?

• To sterilize it

• To remove water and avoid dilution

• To neutralize it

• To remove air bubbles

Which of the following is a correct precaution during titration?

• Do not clean the burette before use

• Read the burette from the bottom of the meniscus at eye level

• Use excess indicator to ensure a clear color change

• Pour acid into the burette

How can the end point of a titration be determined?

• By using a thermometer

• By observing a persistent color change in the solution

• By heating the solution

• By stirring the base continuously

What is the molarity of a 250 mL standard solution prepared using 0.25 mol of oxalic acid?

• 0.10 M

• 0.50 M

• 1.00 M

• 1.5 M