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Purity and Density of metals

Determination of density has many practical applications. Is a piece of jewelry pure gold or is it an alloy perhaps of gold and silver? Give that the densities of gold and silver at 25 degrees C are 19.3 and 10.5g/mL respectively and that the volume of the alloy is the sum of the volumes of the metals used, calculate the density of an alloy that is 75% by mass gold and 25% silver. (Hint: Assume you have 1.00g of the alloy).

Also, determine the density of an alloy that is 50% by mass gold and 50% silver. If the volume of the jewelry is about 1 mL, could you use your lab balance and graduated cylinder to distinguish between pure gold and the above alloys? Explain your answer.


Solution Summary

The solution provides and easy to follow explanation of the concepts and gives all mathematical steps wherever necessary.