(U3) Practicals

Question 1

Give the colour changes for Phenolphthalein and Methyl Orange

Answer 1

1. phenolphthalein :

• colourless in acid.
• pink in alkali solutions.
• colourless in neutral solutions

2. methyl orange :

• red in acid.
• yellow in alkali solutions.
• yellow in neutral solutions

Question 2

During any titrations, how do you ensure all chemicals are transferred between apparatus?

(2)

Answer 2

• Rinse apparatus with deionised water in a wash bottle
• transfer washings into the appropriate container

Question 3

what is a standard solution?

Answer 3

solution of a known concentration