Im following some instructions and I really dont understand what this means. It says 'the residue was vacuum distilled, and the fraction boiling at
75-85°C/8mmHg weighed 90g'
The two compounds that should be in there have boiling points of around 200c and and I know its under vacuum but 8mmHg would do nothing. Im
thinking that could be vapour pressure but im not sure and if it was i dont know why that would even matter. What does the 8mmHg mean and how would
you be able to calculate the boiling point it should have under vacuum? |