Titration practical

Question 1

What is a titration used for?

Answer 1

• Used to find an unknown concentraction of an acid or alkali

Question 2

What is the method of a titration?

Answer 2

• Place 25cm3 of alkali in a conical flask on a white tile (using a pipette)
• Add indicator to conical flask
• Fill burette with acid and note starting vol
• Release acid slowlu and swirl conical flask until colour change occurs
• Note end volume of acid
• Repeat until you get concordant results and calculate average acid used

Question 3

What are the different indicators and the different colour changes that take place (alkali to acid)?

Answer 3

• Litmus = blue to red
• Phenopthalien = pink to colourless
• Methyl orange = yellow to red