I think I understand now. I believe the reaction is:
2NaOH + SiO2
But now I have another question.
It seems to me that silicon dioxide actually reacts with hydroxide ions, and not with NaOH per se (I mean, sodium ions don't participate in the reaction). The actual reaction seems to be like this:
This means that silicon dioxide should theoretically react with any strongly basic solution. Is this correct? Does it react with other strong bases, like Na2
S for instance? I have a 1% solution of sodium sulfide (approximately 0.13M), and it's extremely basic (my paper test strips show pH 14, though I believe it's probably a little lower than that in reality). Will it attack glass, too?