Question

How would the following errors affect the final mass of copper in this experiment? (a) Small...

How would the following errors affect the final mass of copper in this experiment? (a) Small amounts of water remained in the beaker after in the beaker after washing with acetone and drying your sample for a week. (b)While a small amount of solid is lost with the decanted liquid. Copper metal recovered would be less than expected as some amount of Cu(OH)2 is still unconverted.

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Answer #1

a) When there is a small amount of water present in the beaker after washing with acetone it will apparantly increase the mass of copper and we will get a wrong result with positive error.

b) In case of small amount of solid is lost the mass of copper will be less than the ideal result and similarly if some of the copper is not converted into copper hydroxide due to insufficient reagent the mass of copper will be less than ideal value and we will get a wrong result with negative error.

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