to observe a color change to get rid of most impurities to identify the boiling point to collect gases for additional study
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A scientist trying to identify an unknown liquid may heat the liquid. Which would be the best reason for the scientist to heat the liquid?
Possibilities:
- to observe a color change
- to get rid of most impurities
- to identify the boiling point
- to collect gases for additional study

to identify the boiling point