Diffusion investigation of HCL into agar blocks

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Evangeline George 12BBI01 Mr Richardson





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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…

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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…

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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…

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Evangeline George 12BBI01 Mr Richardson

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