Mbra0003: 2 months ago

Question on chemistry moles pls :)

A sample of 4.256g of copper 2 sulfate-2-water is dissolved and made up to 250cm3. A 25.00 cm3 portion is added to an excess of potassium iodide. The iodine formed required 18.0 cm3 of a 0.0950 mol/dm3 solution of sodium thiosulfate. Calculate the percentage of copper in the crystals

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