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Ada
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Report Thread starter 16 years ago
#1
has anyone got a clue about the AS and A2 plan for OCR?
we haven't recieved ours yet and i wanted to know in advance!!
any help would be much appreciated!!!!
thanks
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nafan
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Report 16 years ago
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yeah, i have the AS ocr plan:

"you are required to plan an invetigation to find out if there is a relationship between cell size & diffusion

(cells of agar made with sodium carbonate & containing phenopthalein (a ph indicator change colour when they are placed into a dilute acid. as the acid diffuses through the block, the ph changes & the pink colour of the indicator dissapears
your planning must be based on the assumption that you are provided with the following:
*blocks of agar
*a ph indicator (may be cut to size)
*supply of 2M hydrochloric
*your scools labs resouces


now please post the answer
i need some help with this!
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