Filtration is any of various mechanical, physical or biological operations that separate solids from fluids (liquids or gases) by adding a medium ( a filter) through which only the fluid can pass. The fluid that passes through is called the filtrate.
Filtration is a simple technique used to separate insoluble solids from a solution. Sometimes it is the filtrate that we want to isolate ( as in the making of a cup of coffee), on other occasions it is the residue that is left behind in the filter that is of value.
In the laboratory
In the laboratory suction filtration can speed up the process and help to dry the insoluble residue on the filter paper.
Make a copy of the suction filtration diagram. Add labels to the diagram to help explain why a vacuum pump is used.
What's the connection?
Task 2. Compare the four images above. What is the connection between all four? Which one is the odd one out and why ?
(Hint: There is more than one acceptable answer - so long as you can justify it..)