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sugar concentration-fermentation

Asked by ziat1 | Oct 9, 2008 | A Level > Biology > Coursework
ziat1 asks:

my biology coursework is on the effect on different sugars on the rate of fermentation.
i dont understand how to prepare my sugar concentration. the sugars im using will be glucose, fructose,maltose, sucrose and lactose. i hav been told to use 0.5M of the sugar concentratioin but i dont quite understand what to do and write. can you please help.

etutor answers:

0.5M means that there should be 0.5 of the molecular mass of glucose dissolved in a litre of water

The molecular formula of glucose is C6H12O6.

Since C = 12 g/mol
H = 1 g/mol
O = 16 g/mol


(12x6) + (1x12) + (16x6) = 180g/mol.

Thus, the molar mass of glucose is 180 g/mol.

So. you would need to dissolve 180g of glucose in 1 litre of water (or 18g per 100cm3) to make a 1M solution, 90g per litre or 9g per 100cm3 for 0.5M

You can calculate how to make up the other sugar solutions from their molecular formula

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