Titration

Question 1

What is considered inaccurate titration results?

Answer 1

Any result more than 0.2cm^3 away from each other

Question 2

Suitable indicator for titration

Answer 2

Methyl orange

Question 3

During titration where acid is in burette and alkali is in conical flaskwhen methyl orange changes from:

yellow -> orange
orange -> red

what does it mean for the solution?

Answer 3

yellow -> orange
- exact vol. of acid needed, react completely w/ alkali reached

orange -> red
- excess acid added

Question 4

why is white tile placed at base of retort stand?

Answer 4

• so that colour change can be seen clearly

Question 5

why is burette jet below top of conical flask?

Answer 5

• prevent spillage of acid during titration

No marks if never write “during titration” as acid does not spill on it’s own

Question 6

when to 3sf?
when to 2dp?

Answer 6

• 2dp for burette reading/titration result
• 3sf at all other cases

Question 7

why cannot use universal indicator, but use methyl orange? (for titration)

Answer 7

• Universal Indicator too many colour changes
• Methyl orange ROY
• colour change clear, easier to see

Question 8

imagine a titration setup w/ all apparatus labelled

Answer 8

https://docs.google.com/document/d/1Ep_FO9CxYSFbxmf3Zqg9mgm9NNyt2enpfMDr49gufrU/edit page 4