2f- Acid Alkali Titrations❗️

Question 1

What are the two indicators used for acid-alkali titrations

Answer 1

Phenolphthalein + Methyl orange

Question 2

What are the colours produced by universal indicator when a solution is acidic?

Answer 2

Brown, red, pink, orange

Question 3

What are the colours produced by universal indicator when a solution is alkaline?

Answer 3

Purple, violet, dark blue, blue

Question 4

What is produced during all neutralisation reactions?

Answer 4

Water (H2O)

Question 5

What are acid-alkali titrations used for ?

Answer 5

Determining exactly how much alkali is needed to neutralise an amount of acid

Question 6

What is litmus’ colour in acid?

Answer 6

Red

Question 7

What is litmus’ colour in alkali?

Answer 7

Blue

Question 8

What is phenolphthalein’s colour in acid ?

Answer 8

Colourless

Question 9

What is phenolphthalein’s colour in alkali ?

Answer 9

Pink

Question 10

What is Methyl orange’s colour in acid ?

Answer 10

Red

Question 11

What is Methyl orange’s colour in alkali ?

Answer 11

Yellow

Question 12

Describe how to carry out a titration

Answer 12

• fill a burette with hydrochloric acid + note the reading in cm3
• Measure out a volume of sodium hydroxide solution using pipette
• Put sodium hydroxide solution into conical flask
• add a few drops of indicator
• add acid to conical flask (swirling flask all the time)
• stop adding acid when colour changes
• read volume of acid in burette
• repeat experiment and find mean