Question 7.10: A tooth filling is made of a silver amalgam that comprises 3......
A tooth filling is made of a silver amalgam that comprises 37 mol% silver. What is the activity of the mercury, a_{(\mathrm{Hg)}}?
Step-by-Step
The activity of the mercury a_{(\mathrm{Hg)}} is the same as its mole fraction, x_{(\mathrm{Hg)}}. By definition
x_{(\mathrm{Hg})}+x_{(\mathrm{Ag})}=1
so
x_{(\mathrm{Hg})}=1-x_{(\mathrm{Ag})}=0.63
The activity is therefore
x_{\mathrm{(Hg)}}=a_{\mathrm{(Hg)}}=0.63
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