Diffusion of Hydrochloric Acid Into Different Sizes of Agar Blocks
Diffusion of Hydrochloric Acid into Different Sizes of Agar Blocks
Aim: Investigating the relationship between the diffusion and the surface area to volume ratio, with agar and hydrochloric acid.
Research Question: How does the difference in surface area to volume ratio affect the diffusion?
Hypothesis: As the area to volume ratio increases, the time taken for a complete diffusion will also increase.
Background Information: Agar is a jelly like substance and in this experiment, agar will be used is containing and acid-base indicator called “phenol” and the indicator gets the red color in basic conditions whereas it gets yellow color in acidic ones.
Control Variables: * The same agar will be used for each experiment * All the experiments will be investigated in the same place * Volume and concentration of the Hydrogen Peroxide.
Apparatus: * 1 Petri-dish of agar * Knife * Test tubes * Beakers * 100 cm3 of HCl * Stopwatch * Lab coat * Ruler
Method: * Cut the agar into different sizes of blocks with a knife and measure the size with the help of a ruler to make an accurate experiment. * Put some hydrochloric acid into a test tube and make sure that it will completely cover an agar block. * Then place the agar into the test tube including hydrochloric acid, start timing immediately by the help of a stopwatch. * Observe the agar in test tube; stop the stopwatch when the agar loses all the red color which means that the hydrochloric acid is diffused into the agar completely. * Record your data in a table you have made before. * Repeat the experiment for each of the different sizes of agar blocks
Data Collection: | Agar size 1 | Agar size 2 | Agar size 3 | Agar size 4 | Agar size 5 | Height/cm(±0.05cm) | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | Length/cm(±0.05cm) | 1.0 | 1.3 | 1.7 | 2.0 | 2.6 | Width/cm(±0.05cm) | 0.7 | 0.9 | 1.0 | 1.0 | 1.4 |
Table # 1
| Surface
Aim: Investigating the relationship between the diffusion and the surface area to volume ratio, with agar and hydrochloric acid.
Research Question: How does the difference in surface area to volume ratio affect the diffusion?
Hypothesis: As the area to volume ratio increases, the time taken for a complete diffusion will also increase.
Background Information: Agar is a jelly like substance and in this experiment, agar will be used is containing and acid-base indicator called “phenol” and the indicator gets the red color in basic conditions whereas it gets yellow color in acidic ones.
Control Variables: * The same agar will be used for each experiment * All the experiments will be investigated in the same place * Volume and concentration of the Hydrogen Peroxide.
Apparatus: * 1 Petri-dish of agar * Knife * Test tubes * Beakers * 100 cm3 of HCl * Stopwatch * Lab coat * Ruler
Method: * Cut the agar into different sizes of blocks with a knife and measure the size with the help of a ruler to make an accurate experiment. * Put some hydrochloric acid into a test tube and make sure that it will completely cover an agar block. * Then place the agar into the test tube including hydrochloric acid, start timing immediately by the help of a stopwatch. * Observe the agar in test tube; stop the stopwatch when the agar loses all the red color which means that the hydrochloric acid is diffused into the agar completely. * Record your data in a table you have made before. * Repeat the experiment for each of the different sizes of agar blocks
Data Collection: | Agar size 1 | Agar size 2 | Agar size 3 | Agar size 4 | Agar size 5 | Height/cm(±0.05cm) | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | Length/cm(±0.05cm) | 1.0 | 1.3 | 1.7 | 2.0 | 2.6 | Width/cm(±0.05cm) | 0.7 | 0.9 | 1.0 | 1.0 | 1.4 |
Table # 1
| Surface