Acid-Base Titration Concepts

The video tutorial covers the concept of acid-base titration, explaining how it is used to determine the concentration of an unknown solution by using a solution of known concentration. It discusses the role of indicators like phenolphthalein, which change color at the equivalence point. The tutorial provides a step-by-step guide on setting up and conducting a titration experiment, including a rough titration for estimation and a more accurate titration for precise results. Safety precautions and calculation methods for determining the concentration of the analyte are also covered.

What is the main purpose of an acid-base titration?

• To determine the pH of a solution

• To find the concentration of an unknown reagent

• To identify the color change of an indicator

• To measure the temperature change in a reaction

What is the equivalence point in a titration?

• The point where the pH is neutral

• The point where the solution changes color

• The point where moles of acid equal moles of base

• The point where the reaction starts

Why is phenolphthalein commonly used as an indicator in titrations?

• It turns bright pink at the equivalence point

• It is the cheapest indicator available

• It changes color at a neutral pH

• It is the only indicator that works with all acids and bases

What is the role of an indicator in a titration?

• To measure the temperature of the solution

• To neutralize the acid

• To provide a visible signal of the equivalence point

• To increase the reaction rate

What is the first step in setting up a titration experiment?

• Adding the acid to the burette

• Assembling the ring stand and burette

• Filling the Erlenmeyer flask with base

• Adding the indicator to the base

Why is it important to check for leaks in the burette before starting a titration?

• To ensure the base does not evaporate

• To prevent inaccurate volume measurements

• To avoid contamination of the acid

• To make sure the indicator works properly

What is the purpose of performing a rough titration?

• To determine the exact concentration of the acid

• To practice using the equipment

• To measure the pH of the solution

• To get an initial estimate of the equivalence point

How can you ensure accuracy during the final stages of a titration?

• By heating the solution

• By using a different indicator

• By adding small amounts of base slowly

• By adding large volumes of base quickly

Why are multiple titrations performed in an experiment?

• To practice the procedure

• To obtain a more accurate average concentration

• To ensure the equipment is working

• To use up all the chemicals

What might change when using a weak acid or base in a titration?

• The color of the solution

• The type of glassware used

• The volume of the titrant needed

• The pH at the equivalence point