Hydrofluoric acid (HF) is produced by treatment of the mineral fluorite (CaF2) with concentrated sulfuric
acid (H2SO4) at 265 °C. It is a precursor to almost all fluorine compounds, including Prozac (a
pharmaceutical drug) and Teflon. HF is a colourless solution that is highly corrosive, capable of dissolving
many materials, especially oxides such as glass (HF, Ka = 6.8 x 10-4
)
(a) What is the pH of a 0.380 M aqueous solution of HF?
(b) What is the pH of a 0.040 M aqueous solution of HF?