Biology Diffusion Science ISA
Biology diffusion Science ISA To find out if concentration affects the rate of diffusion.
I predict that the higher the concentration of acid the faster the reaction will be.
Dependent variable: We are measuring the time taken for the pink indicator to turn clear when hydrochloric acid is added to it.
Independent variable: We are changing the molar of hydrochloric acid we are adding to the gelatine cubes.
Apparatus:
* 1 measuring cylinder
* 1 test tube
* 1 stop clock
* A large gelatine cube containing indicator and NaOH
* Hydrochloric acid ranging from 1-3 molars
* A scalpel
Diagram:
Method:
* Take the large gelatine cube and cut into 15 equal pieces
* Place on piece of the cube into the test tube
* Measure out 10mls of HCl in the measuring cylinder
* Pour the HCl into the test tube with the gelatine cube and start the clock
* Time how long it takes for the pink colour inside the gelatine cube to completely disappear
* You will also notice that the cube dissolves slightly
Fair test: To ensure that this experiment is a fair test I will take a number of precautions:
* Ensure that all the gelatine cubes are the same size so that the time taken for is accurate
* Ensure that the acid is measured out to exactly 10mls each time to keep it fair
* Use the same equipment each time so there are no variations
Safety: To make sure that this experiment is safe you should wear safety goggles so as not get and HCl into your eyes at it is highly corrosive and irritant. You should also tuck your tie into your shirt so that it does not hang into the HCl or any other part of the equipment or apparatus. Make sure you have a clear working area so that no accidents occur whilst you are conducting your investigation. There is no Bunsen burner or any other dangerous equipment in involved in this investigation apart form the HCl therefore there are not many safety precautions.
Piece
I predict that the higher the concentration of acid the faster the reaction will be.
Dependent variable: We are measuring the time taken for the pink indicator to turn clear when hydrochloric acid is added to it.
Independent variable: We are changing the molar of hydrochloric acid we are adding to the gelatine cubes.
Apparatus:
* 1 measuring cylinder
* 1 test tube
* 1 stop clock
* A large gelatine cube containing indicator and NaOH
* Hydrochloric acid ranging from 1-3 molars
* A scalpel
Diagram:
Method:
* Take the large gelatine cube and cut into 15 equal pieces
* Place on piece of the cube into the test tube
* Measure out 10mls of HCl in the measuring cylinder
* Pour the HCl into the test tube with the gelatine cube and start the clock
* Time how long it takes for the pink colour inside the gelatine cube to completely disappear
* You will also notice that the cube dissolves slightly
Fair test: To ensure that this experiment is a fair test I will take a number of precautions:
* Ensure that all the gelatine cubes are the same size so that the time taken for is accurate
* Ensure that the acid is measured out to exactly 10mls each time to keep it fair
* Use the same equipment each time so there are no variations
Safety: To make sure that this experiment is safe you should wear safety goggles so as not get and HCl into your eyes at it is highly corrosive and irritant. You should also tuck your tie into your shirt so that it does not hang into the HCl or any other part of the equipment or apparatus. Make sure you have a clear working area so that no accidents occur whilst you are conducting your investigation. There is no Bunsen burner or any other dangerous equipment in involved in this investigation apart form the HCl therefore there are not many safety precautions.
Piece