Titrations

Question 1

What happens during volumetric analysis?

Answer 1

Measure volume of one solution reacting with measured volume of different solution

Question 2

What is an acid-base titration?

Answer 2

Special type of volumetric analysis where you react solution of acid with solution of alkali

Question 3

What do you need to do for an acid-based titration?

Answer 3

• Know concentration of 1 of 2 solutions, usually a standard solution
• In analysis, use standard solution to find out unknown information about substance dissolved in second solution

Question 4

What can the unknown information in a standard solution be?

Answer 4

• Concentration of solution
• Molar mass
• Formula
• Number of molecules of water of crystallisation

Question 5

What is an indicator?

Answer 5

• Identifies end point
• Must be different colour in acidic solution to basic solution

Question 6

What colour is methyl orange in acid?

Answer 6

Red

Question 7

What colour is methyl orange in base?

Answer 7

Yellow

Question 8

What colour is methyl orange’s end point?

Answer 8

Orange

Question 9

What colour is bromothymol blue in acid?

Answer 9

Yellow

Question 10

What colour is bromothymol blue in base?

Answer 10

Blue

Question 11

What colour is bromothymol blue’s end point?

Answer 11

Green

Question 12

What colour is phenolphthalein in acid?

Answer 12

Colourless

Question 13

What colour is phenolphthalein in base?

Answer 13

Pink

Question 14

What colour is phenolphthalein’s end point?

Answer 14

Pale pink