Diffusion investigation of HCL into agar blocks

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Evangeline George 12BBI01 Mr Richardson

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Evangeline George 12BBI01 Mr Richardson
Diffusion Investigation
Agar is a jelly like substance and in this experiment, agar will be used containing a PH
indicator called phenolphthalein and dilute sodium hydroxide. The indicator is pink in alkaline
conditions and decolourises in acidic ones.
Aim: The aim of this investigation is to explain the relationship between surface area, volume
ratio and diffusion rates of living organisms.
Prediction: I predict that the diffusion rate will decrease when the surface area decreases.…read more

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Evangeline George 12BBI01 Mr Richardson
11. Record the results in a table presented with two columns one for the size of the cube
and the other for time taken in seconds.
Variables:
The independent variable is the size of the cube used. In this investigation the length is
changed.
The dependent is the time taken for the stain agar to turn colourless which was timed in
seconds.…read more

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Evangeline George 12BBI01 Mr Richardson
the results in each of the table the trend shows that as the surface area to volume ratio decreases
the time taken for the block to turn colourless increased. Therefore as the time taken represents the
diffusion of the hydrochloric acid this tells us that diffusion is directly proportional to the ratio of
surface area to volume. Bigger S.A: V causes an increased or faster diffusion rate.…read more

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Evangeline George 12BBI01 Mr Richardson…read more

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