# Purity and Density of metals

Not what you're looking for?

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.

##### Purchase this Solution

##### Solution Summary

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

##### Solution Preview

Please see the attachment.

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).

If we have one gram of the alloy, it will contain 0.75g gold and 0.25g silver.

Because gold has a density ...

##### Purchase this Solution

##### Free BrainMass Quizzes

##### Thermochemistry

The quiz helps in revising basic concepts about thermochemistry.

##### Functional groups in Organic Chemistry

You will be tested on the names of functional groups in Organic Chemistry. It is very important to know the functional groups to understand Organic reactions.

##### General Chemistry - Classification of Matter

This test will assess your knowledge on the classification of matter which includes elements, compounds and mixtures.

##### Match Elements with their Symbols

Elements are provided: choose the matching one- or two-letter symbol for each element.