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A Level Chemistry: Strengths of acids HELP

Hi! If anyone could explain this question from the AQA spec paper that would be really helpful as I’ve no idea what it’s on about. Thanks in advance!

Question:
Use the concept of electronegativity to justify why the strengths of ethanedioic acid and ethanoic acid are different. (6 marks)

Extra info given in question:
- Ethanedioic acid is a weak acid
- Ethanedioic acid acts, initially, as a monoprotonic acid

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