Please calculate the pKa of hydrofluoric acid given that HF(aq) and hydrogen cyanide (HCN). HF(aq): -273.30 Δ H^0 f kJ mol^-1   HCN (aq): 107.1 ΔH^0 f kJ mol^-1 119.7 ΔG^0 f kJ mol^-1   (a) pKa of hydrofluoric acid and hydrogen cyanide (HCN)? (b) What would be the pH of a solution containing 5 mM HF? (c) What would be the pH of a solution containing 5 mM HCN?

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