Question

Silicon dioxide solid plus aqueous hydrofluoric acid (HF) yield solid silicon tetrafluoride plus liquid water

Answer 1

Aqueous hydrofluoric acid will react with the glass, which is represented by silicon dioxide, and produce silicon tetrafluoride, a gas that will be given off, and liquid water. To balance this equation, all you have to do is multiply the hydrofluoric acid by 4 and the water by 2 .