Method and Set up
The three solutions tested in the beakers.
water, dry ice and water and vinegar
mass of shell
The solution expected to cause moderate shell mass loss.
water with dry ice
This indicator was used to measure pH.
universal indicator
one controlled variable related to solution
volume of liquid (150mL)
The solution expected to cause the greatest shell mass loss.
vinegar
The reason shells were soaked before the experiment.
to remove organic matter
one controlled variable related to the shells
size/ type of shell
The trend observed as pH decreases.
increased mass loss
Why shells were dried before recording final mass.
ensure accurate measurements
why are controlled variables important in this experiment?
ensure a fair test
A visible change that might be observed on shells in acidic solutions.
surface erosion or roughness
the number of different solutions used
3
the independant variable
pH solution
the solution expected to show the least change
water