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    I'm having trouble understanding how they get the answer in (iii). In the markscheme it simply says to do 10 x (ii). I don't understand why they do this, or the method behind it. Any help will be greatly appreciated

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    (Original post by Drilon)
    I'm having trouble understanding how they get the answer in (iii). In the markscheme it simply says to do 10 x (ii). I don't understand why they do this, or the method behind it. Any help will be greatly appreciated

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    If you read the bit at the start of the question, it says that they make up a solution of 250 cm3 using 3.44g of the Metal Carbonate. However, in the neutralisation reaction only 25cm3 is used, a tenth of the original solution. As such, the number of moles in the 25cm3 will be a tenth of the moles in the original solution, so you have to multiply your answer in part (ii) by ten to find the moles in the 3.44 g sample.
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    Thank you soo much, I hate it how AQA always have to be sneeky in their questions, its like you always have to read the small print on a dodgy company

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