Diffusion of Hydrochloric Acid Into Different Sizes of Agar Blocks

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  • Topic: Chlorine, PH, US standard clothing size
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  • Published : March 19, 2013
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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 Area/cm2|...
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