If I pour 10ml of 0.5M Co(No3)2 stock solution in to a sample vial and use it to make up 4 different solutions ranging in concentration from 0.025M to 0.1M by pippetting 500, 1000, 1500 and 2000 micro-litres in to separate vials and making up to 10ml with of deionised water, what are the concentrations of each?
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