[The Wikipedia article about trimethylsilanol][1] says the following:

> Trimethylsilanol is a weak acid with a $\mathrm{p}K_\mathrm{a}$ value of 11. The acidity is comparable to that of orthosilicic acid, but much higher than the one of alcohols like tert-butanol ($\mathrm{p}K_\mathrm{a}$ 19).

Why is it so? A silicon atom is more electropositive than a carbon atom, therefore the conjugate base should be more destabilized by the *+I* effect of the $\ce{Si(CH3)3}$ group compared to the $\ce{t-Bu}$ group.


  [1]: https://en.wikipedia.org/wiki/Trimethylsilanol