Separation of solid lead nitrate from lead nitrate solution GCSE Additional ScienceWatch
State how solid lead nitrate can be obtained from lead nitrate solution.
The mark scheme section for this question says:
allow to crystallise
allow heat / boil / cool
do not allow freeze
ignore filtration <-----
I was told in school that to separate an insoluble solid from a solution you do filtration and to separate a soluble solid from a solution you do evaporation.
What I do not understand is that the question itself does NOT mention whether the solid lead nitrate is an insoluble solid or a soluble solid. AFTER looking at the MARKS SCHEME can I tell that the solid lead nitrate is a soluble solid.
How would I know, just by looking at the question, if the solid lead nitrate is an insoluble solid or a soluble solid?????????
As it is only then I can decide whether filtration or evaporation should be used to separate the solid lead nitrate from the lead nitrate solution.