Modelová Otázka ID 2723 - 
Vzorec dihydrogenkřemičitanu hlinitého je:
Správná odpověď je: D
Jedná se o sůl, která vznikla odtržením několika vodíků od původní kyseliny. Dihydrogenkřemičitan hlinitý musí být odvozen od kyseliny s větším počtem vodíků než dva, v tomto případě tedy kyseliny tetrahydrogenkřemičité – H4SiO4. Odtržením dvou vodíků vznikne skupina (H2SiO4)−II.
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