 Solution

ID: past-exam-of-the-year-2-of-the-earth-sciences-geology-course-of-the-university-of-oxford/2024/paper-3/10/iii/solution

a_{H_{4} Si O_{4}}^{2}

when the solid and water activities equal one. Therefore its equilibrium line is

x = \frac{1}{2} lo g_{10} K = - 5.515,

a vertical line through the intersection of the other two. There is no dependence on

y

, because the net reaction contains neither hydrogen ions nor sodium ions.

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