Joynzer
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Hi can anybody possibly explain question 6d on the June 2011 F325 paper please?

Here is the paper: http://www.ocr.org.uk/Images/65361-q...d-elements.pdf

I understand everything that is mentioned on the mark scheme except the last marking point. It refers to the enthalpy change of solution being affected more by the lattice enthalpy than the hydration enthalpies. Can anybody explain why?

Here is the mark scheme: http://www.ocr.org.uk/Images/61819-m...ts-january.pdf

Thank you!
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charco
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(Original post by Joynzer)
Hi can anybody possibly explain question 6d on the June 2011 F325 paper please?

Here is the paper: http://www.ocr.org.uk/Images/65361-q...d-elements.pdf

I understand everything that is mentioned on the mark scheme except the last marking point. It refers to the enthalpy change of solution being affected more by the lattice enthalpy than the hydration enthalpies. Can anybody explain why?

Here is the mark scheme: http://www.ocr.org.uk/Images/61819-m...ts-january.pdf

Thank you!
Because the lattice enthalpy is usually much larger than the sum of the hydroation enthalpies ...
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