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I have seen Basicity to be calculated as $\mathrm{B} = wt\%\:\ce{CaO}/wt\%\:\ce{SiO2}$ particularly in slag bascity/acidity calcuations. Now I do not think that $\ce{CaO}$ is the most basic oxide that we have or $\ce{SiO2}$ is the most acidic oxide then why are they calculated accordingly? On a lighter note in my geology classes, I have been taught to classify minerals as acidic on the basis of Silica content. Are they related? Please explain with close reference to context.

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  • $\begingroup$ The title question does not make much sense. Aside of that, it is not about being so basic ( high B ) nor so acidic ( low B ), but about being relatively basic or acidic. Extracts of rocks or soil with high(low) B have relatively high(low) pH. $\endgroup$ – Poutnik Aug 11 at 14:50
  • $\begingroup$ @Poutnik But why $CaO$ and $SiO_2$ are only chosen? $\endgroup$ – user586228 Aug 11 at 15:08
  • $\begingroup$ It is an empirical parameter based on the major representatives of basic and acidic items, easy to determine. $\endgroup$ – Poutnik Aug 11 at 16:39

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