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Biology p53..

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heyy guys..how was it??i found the 1st qs pretty challenging but the second was quite easy..
 
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i did it by serial dilution..wbu?i told der to take 75g of saolid and liquify it and dan serial dilution

i did it by dilution as well. adding 200cm3 of the 25mmoldm-3 solution and 10cm3 of water to prepare a 20mmoldm-3 solution and so on. I wasn't sure if to use a solid or not because i felt that was more chemistry rather than biology as we would have had to calculate number of moles?
what do you think?
 
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