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Dissolution rate of silver-20% gold allow, assuming an average density

A silver-20% gold alloy sample (1 cm diameter and 0.2 cm height) is subjected to a selective silver dissolution in 0.1 M HNO3 at current density of 1 mA/cm^2.

How long will it take until the total amount of silver is dissolved? Assume the average density of 8 g/ cm^3 for the alloy sample.

Solution Preview

Volume of the alloy = 4/3 π r2 h
= 4/3 X 3.14 X 0.5 X 0.5 X 0.2 = 0.209 cm3

Density given = 8 g/cm3

Therefore, ...

Solution Summary

An allow is subjected to a selective silver dissolution. Solution provides brief and conclusion equational explanation of how to calculate the dissolution rate of a silver-20% gold allow. Expert assumes an average density of 8g/cm^3 for the alloy sample. Expert guides student on how to avoid calculation error.