Unmasking the Unknown Base

What is a titration? Why is it a useful technique in chemistry?

What is an acid? What is a base?

What is an indicator, and how does phenolphthalein work?

• An indicator is a substance that changes color to indicate the presence of an acid or base; phenolphthalein turns pink in basic solutions.

• An indicator is a device used to measure temperature; phenolphthalein is used in thermometers.

• An indicator is a type of chemical reaction; phenolphthalein is used to speed up reactions.

• An indicator is a tool for measuring pH levels; phenolphthalein turns blue in acidic solutions.

What safety precautions should we take when working with acids and bases?

• Wear protective gear

• Work in a well-ventilated area

• Store acids and bases separately

• All of the above

What was the calculated concentration of the unknown base?

It is important to add the acid slowly and carefully during the titration because:

• It prevents splashing and ensures safety.

• It allows for a more accurate measurement.

• It helps in maintaining the temperature.

• It speeds up the reaction.

What would happen if we forgot to add the phenolphthalein indicator?

• The solution would remain colorless.

• The solution would turn pink.

• The solution would turn blue.

• The solution would turn yellow.

How could we make this experiment more accurate?

• By increasing the sample size

• By reducing measurement errors

• By using more precise instruments

• All of the above

Can you think of any real-world applications of titrations?

A(n) ___________ is a procedure in which a solution of known concentration is used to determine the concentration of an unknown solution.

• experiment

• titration

• chemistry

• reaction